Castle School



SA67 8HB

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An Independent

Co-educational Day School

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Who we are

Castle School places great importance on recruiting and developing talented staff.  Teachers are highly qualified or experienced and fully committed to all areas of school life.  They play a vital role in ensuring the effectiveness of the school and in enriching the experiences of pupils during their time at Castle School and beyond, whether it be academic, co-curricular or pastoral.   In addition to the subject teachers below, our support staff are all degree qualified.  They, too, are crucial to the school’s success, being committed, enthusiastic and caring.  They work tirelessly to support the subject staff and ensure that the needs of every child is met.


Su Cowell - Su studied Mathematics at University College, Cardiff where she also completed her PGCE.  She joined the maths department at Marlborough College, during which time she also worked at St Peters Collegiate School, Adelaide, S Australia.  She worked as a producer in educational broadcasting for several years before returning to the class room, firstly at Reigate Grammar School and then at Canford School, where she was also a boarding housemistress.  Su has been at Castle School for three years , taking over the headship in June 2018.

Science, Maths and ICT

Chemistry - Jayne White (Head of Science).

 Jayne studied Chemistry at the University of York before she went on to work for a pharmaceutical company in Eastbourne analysing drugs in the Quality Control department using a range of analytical techniques.  Her next role was at Stockton on Tees as a Research Chemist for an engineering company acting as a shift team leader on a plasma arc furnace as well as working on improving bio-oxidation studies on leachate from South African Gold mines to improve gold output. On moving to Pembrokeshire she first of all worked at Fort Popton in the lab analysing North Sea mud samples for oil components. After completing her PGCE she then went on to teach at Milford Haven School for nineteen years where she had several roles such as Head of Chemistry, Assistant Head of Sixth Form, KS5 Welsh Baccalaureate and Key Skills co-ordinator and had responsibility for the NQF Science Qualification.  She is currently an examiner for the WJEC GCSE Chemistry course and started as Head of Science at Castle School in September 2018.

Biology - John Rees

John completed a BSc Botany, a PGCE in Science and Certificate of Education in PE at UCW Aberystwyth. He taught at Greenhill School for 35 years, where, over time, he fulfilled various roles; Head of Year; Head of Biology; Head of Science and finally Assistant Headteacher. He has worked for Qualifications Wales accrediting the new GCSE Science and Biology specifications and is currently an A Level Biology examiner. John joined Castle School in 2016 and teaches GCSE and A level Biology.

Physics - Sharon Lloyd

Sharon obtained a Bachelors degree from Southampton University and a Masters degree from Northern Arizona University. She has worked both in UK and overseas for 30 years, teaching Physics for various courses, but predominantly the International Baccalaureate. Sharon joined Castle School in 2016 teaching GCSE and A level Physics. Sharon is also an examinations marker for the International Baccalaureate.

Maths - Laura Penhallurick

Laura studied Early Years Education at the University of South Wales gaining a large knowledge base of how children and young people learn. Unsure of which career path and which ages Laura wanted to teach, Laura joined Castle School in 2015 as an LSA. After two years of specialising in 1-1 teaching and assisting in Maths lessons, gaining relevant qualifications and experience, Laura left Castle school in 2017 to attend Bangor University and study her PGCE.  She is now back with us, teaching KS3 and KS4 maths. 

Maths - Su Cowell

In addition to her role as Head, Su has over 20 years’ teaching experience, including A level Maths and Further Maths and continues to teach Maths to GCSE classes, including those on the school’s accelerated programme studying for Additional Maths in years 10 and 11. Su is also an examiner for WJEC Maths.

Computer Science - Stephen Vaughan

After leaving college, Stephen worked for a Pembrokeshire-based company writing software for electronic point of sale systems sold throughout the U.K. and Europe, whilst concurrently studying for his BSc in computing from the OU.  Stephen has always enjoyed software engineering, and worked for many years writing large turn-key software solutions for companies such as BLMS (Bass brewers) in Burton-on-Tent, and NuAire and Sony in Cardiff.  Stephen is studying latest technologies with the OU including project management, IT security, robotics, neural networking and artificial intelligence.

ICT - Ruth Harris

Ruth gained her degree at Nottingham University in 1993.  Before joining Castle School in 2009 she worked as a freelance graphic designer for a local IT company and in addition to her role as Director of Outdoor School, Ruth delivers BTEC IC&T at KS3. 

English and Humanities

English - Gill Roberts

Gill studied English Literature at Swansea University and completed her PGCE at The College of St. Paul and St. Mary, Cheltenham.   She taught in Wiltshire for five years before returning to Pembrokeshire to have a family.   Gill taught English at Greenhill School, Tenby for twenty three years, and has also been an examiner for WJEC.  Gill has been teaching at Castle School since September 2017.

English - Sophie Hammond

Sophie has a degree in English Literature from Durham University and a PGCE in secondary English and Drama from Oxford University.  She teaches English to Years 7 and 8 and a weekly English enrichment class to Year 11.  With twenty years’ experience in the classroom, Sophie has taught English and Theatre Studies from Year 4 to A-level at senior and preparatory schools in London, Bermuda and the South of England.  Sophie has been Head of Learning Support and Director of Studies at various times in her career, but she is relishing the time back in the classroom her new role has given her.

Geography - Stephen Harries

Stephen studied BSc Geology and a post graduate degree in Geography at UCW Aberystwyth.  He went on to teach in Hertfordshire and North London until 1994 when he came to Pembrokeshire and continued teaching.  Stephen has also been an external verifier for ULSEb and GNVQ.  Stephen has been at Castle School since September 2016.

History - Dan Harries

As well as heading up the modern languages department, Dan also teaches History at Castle School.


Latin and French - Dan Harries

Dan Studied MFL (modern foreign languages) at Cardiff University. He completed his PGCE specialising in MFL and history at Aberystwyth University before working at Sir Thomas Picton as a teacher of French and German. Dan joined Castle School in 2014 and currently teaches History, Latin and French.

Spanish - Tiggy Burrows

Tiggy has a degree in Modern Languages with Business and Management from Aberystwyth University and a Masters in Translation from the University of Bristol. Her working translation languages are Spanish and French into English and she specialised in Young Adult Literature for her dissertation. Between studies Tiggy taught English at a secondary school in the Basque Country and has worked at a Montessori childcare centre in Barcelona.  Tiggy joined Castle School in September 2018 as a Spanish Teacher.

Welsh - Fiona Thomas

Fiona read Law and Politics at Lancaster University for one year before moving to Aberystwyth University where she read History and Welsh history through the Welsh Medium, graduating with a B.A. Joint Honours in 1996. Fiona then joined the Civil Service and worked in The Welsh Office Cardiff before returning to Pembrokeshire in 1998 to pursue her career in teaching and has taught Welsh for twenty years at Milford Haven Junior School . She has recently joined the teaching staff at Castle School.

Physical Education, Art and Music

PE - Penny Bowen

Penny obtained her degree from IM Marsh College of Physical Education in Liverpool.  Penny taught PE at Westwood Girls School and then at Highdown School, both in Reading.  Penny became head of Girls PE at Milford Haven Grammar School in 1981 then Head of PE at Milford Haven Comprehensive from 1988 – 2014.  Since then, Penny has been head of PE at Castle School.  Penny is also a Duke of Edinburgh Award Assessor, a Youth Club Leader, Sports Leadership Tutor, County Netball and Hockey Coach and Treasurer of Pembrokeshire School’s Hockey and Netball Association.  

Art - Sarah Hope

Sarah studied for her degree in Fine Art in Portsmouth and is now a working, award winning artist, specialising in portraiture and figurative art.  Sarah exhibits locally, in Cardiff and London.  Sarah has worked in education for 18 years and at Castle School for the past six years.

Music - Ben Davies

Ben studied his Degree in music at The Bristol Institute of Modern Music and has over 10 years’ experience in teaching guitar, bass and music theory. He is currently active within the music industry; working as a live musician, session player, sound technician and music transcriber. Ben has been at Castle School since September 2017 and is currently teaching GCSE music as well as 1-on-1 guitar and bass lessons.

Music - Isobell Jones

Isobell studied at the Royal Welsh College of Music & Drama where she gained her Licontiate Diploma (LWCMD) and a Diploma from the London College of Music (ALCM).  Isobell moved to Pembrokeshire where she has been a musician and teacher of music (piano, violin, flute) for 30 years.  Isobell is also a member of the Associated Board (ABRSM) Teacher Voices Panel. Isobel remains an active musician and plays with Symphonica Tywi and Cwm Cenwyn String Quartet.  She also sings with the Dyfed Choir.

Outdoor School / PSHE

Ruth Harris

Ruth has had a diverse career including developing and delivering environmental education programmes locally, nationally and internationally. Ruth also has a wealth of experience with young people having worked with the Princes Trust, Duke of Edinburgh Award and the Rising Tide Project at Pembrokeshire College.  Ruth is the Director of Outdoor School and also Head of Pastoral Care, delivering PSHE.