| Sacred Heart School | Hammersmith, London |
| Sacred Heart School | Liverpool, Merseyside |
| Sacred Heart School | Newcastle, Tyneside |
| Saddleworth School | Oldham, Lancashire |
| Salesian College | Farnborough, Hampshire |
| Saltley School | Birmingham, West Mids |
| Samuel Whitbread School | Shefford, Bedfordshire |
| Sandbach School | Sandbach, Cheshire |
| Sandhill View School | Newcastle, Northumberland |
| Sandown High School | Sandown, Isle of Wight |
| Sandy Upper School | Sandy, Bedfordshire |
| Scarsbrook School | Scarsbrrok, Surrey |
| Seaford Head Community College | Seaford, East Sussex |
| Selhurst High School | Croydon, London |
| Selkirk High School | Selkirk, Borders |
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| Selly Park School | Birmingham, W.Mids |
| Severndale School | Gloucester, Gloucestershire |
| Shavington School | Crewe, Cheshire |
| Shenley Court School | Birmingham, W.Mids |
| Shireland Language College | Smethwick, Birmingham |
| Shire Oak School | Walsall, West Midlands |
| Shirley High School | Croydon, London |
| Shitley High School | Dale, Pembrokshire, Cymru (Wales) |
| Sidmouth College | Sidmouth, Devon |
| Silcoates School | Wakefield, West Yorks |
| Sir Christopher Hatton School | Wellingborough, Northants |
| Sir Henry Ffyod Grammar School | Aylesbury, Bedfordshire |
| The Sir John Colfax School | Bridport, Cymru (Wales) |
| Sir John Talbot's School | Whitchurch, Oxfordshire |
| Sir Joseph Williamsons Mathematical School | Medway, Kent |
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| Sir Roger Manwoods School | Sandwich, Kent |
| Sittingbourne Community College | Sittingbourne, Kent |
| Skegness Grammar School | Spilsby, Lincolnshire |
| Skinners' School | Tunbridge Wells, Kent |
| Smithills School | Bolton, Lancashire |
| Sneyd Community School | Walsall, West Midlands |
| Solihull School | Solihull, W.Mids |
| Southborough School | Surburbition, Surrey |
| South Bromsgrove High School | Bromsgrove, Birmingham |
| South Craven School | Keighley, West Yorkshire |
| Southend High School for Boys | Southend |
| Southfield School | Kettering, Northants |
| Southfields Community College | Tooting, London |
| Southlands School | Hythe, Kent |
| South Hampstead High School | London, England |
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| South Molton College | South Molton, Devon |
| South Wirral High School | Eastham, Wirral |
| Spalding High School | Spalding, Lincolnshire |
| Sponne School | Towcester, Northamptonshire |
| Sprowston School | Norwich, Norfolk |
| Stanground School | Peterborough, Cambrdgeshire |
| Stanley School | Stanley, Co. Durham |
| Stamford High School | Stamford, Lincolnshire |
| Stamford High School College | Oakham, Leicestershire |
| Stanselm College | Birkenhead, Merseyside |
| Steiner School | Holywood, N.Ireland |
| Stockitt School | Northampton, Northamptonshire |
| Stocksbridge High School | Sheffield, South Yorks |
| Stoke High School | Ipswich, Suffolk |
| Stoke Newington School | London, England |
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| Stonelow High School | Rutherglen, Strathclyde |
| Stonyhurst School | Blackburn, Lancashire |
| Stowe School | Eton, Berkshire |
| Stowupland High School | Stowmarket, Suffolk |
| Stratford School | Forrest Gate, London |
| The Streetly School | Birmingham, West Mids |
| Stringer School | Brighton, West Sussex |
| Studley High School | Studley, Warwarkshire |
| Sturminster Newton High School | Stalbridge, Dorset |
| Sunderland High School | Sunderland, Tyneside |
| Sunnydale School | Shildon, Durham |
| Surbiton High School | London |
| Sutton Centre Community College | Sutton-in-Ashfield, Nottinghamshire |
| Sutton Coldfield Grammar School for Girls | Sutton Coldfield, West Midlands |
| Sutton Grammar School for Boys | Sutton, Surrey |
| Swanlea School | Whitechapel, London |
| Swansea College | Swansea, W.Glamorgan |
| Swinton Comprehensive School | Swinton, North Yorkshire |
| Swanshurst College | Birmingham, West Mids |
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