| Macmillan College | Cleveland |
| Maesteg Comprehensive School | Maesteg, Cymru (Wales) |
| Maiden Erlegh School | Reading, Berkshire |
| Malmesbury School | Malmesbury, Wiltshire |
| Malvern Girls College | Malvern, Worcestershire |
| Manor School | Raunds, Northamptonshire |
| Manshead Upper School | Caddington, Bedfordshire |
| Maplesden Noakes School | Maidstone, Kent |
| Mark Hall School | Harlow, Essex |
| Marlborough Church of England School | Woodstock, Oxfordshire |
| Marlwood Secondary School | Thornbury, S.Gloucs |
| Marriots School | Stevenage, Herts |
| Marlborough School | St.Albans, Hertfordshire |
| Marshalls Park School | Romford, Essex |
| Maryhill School | Kidsgrove, Staffordshire |
| Maria Fidelis Convent School | London |
| The Maths School | Rochester, Kent |
| Mayflower High School | Billericay, Essex |
| Maynard School | Exeter, Devon |
| Meadowhead School | Sheffield, West Yorks |
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| Melksham School | Chippenham, Wiltshire |
| Mellowlane School | London |
| Meole Brace School | Shrewsbury, Shropshire |
| Meon Cross School | Southampton, Hampshire |
| Merchiston Castle School | Edinburgh, Scotland |
| Methodist College | Belfast, Northern Island |
| Michael Ramsey School | London |
| Midhurst Grammar School | Midhust, West Sussex |
| Mildenhall Upper School | Mildenhall, Suffolk |
| Mile Cross School | Norwich |
| Milford Haven Comprehensive School | Milford Haven, Cymru (Wales) |
| Millais School | Horsham, West Sussex |
| Mill Hill County High School | Mill Hill, London |
| Milltown School | Strabane, N.Ireland |
| Minehead Middle School | Minehead, West Somerset |
| Minster College | Leominster, West Mids |
| The Minster School | Southwell, Nottinghamshire |
| MLE School | Eneskillen, N.Island |
| Monks Walk School | Welwyn Garden City, Herts |
| Monkton Combe School | Bath, Avon |
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| Monmouth Comprehensive School | Monmouth, Cymru (Wales) |
| Montgomery High School | Blackpool, Lancashire |
| Moseley School | Birmingham, West Mids |
| Moorfield School | Bolsover, Chesterfield |
| Moorhead High School | Accrington, Lancashire |
| Moorside High School | Stoke on Trent, Staffordshire |
| Morecambe High School | Morecambe, Lancashire |
| Moreton Community School | Wolverhampton, W.Mids |
| Moulton School | Northampton, Northants |
| Mount Carmel School | London |
| Mount Lourdes Grammar School | Enniskillen, N.Island |
| Mount St.Mary's College | Spinkhill, Derbyshire |
| Mulberry School for Girls | London |
| Myrtle Springs School | Sheffield, S.Yorkshire |
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