| | Marine Lake Pleasure Beach | Rhyl, Denbighshire, Wales, United Kingdom | - | | - |
| Marleybrook Funfair | Canterbury, Kent, England, United Kingdom | Operating | | 1 |
| | Marvel's Amusement Park | Scarborough, North Yorkshire, England, United Kingdom | - | - | - |
| M&Ds Scotland's Theme Park | Motherwell, North Lanarkshire, Scotland, United Kingdom | Operating | ≤ | 2 |
| | Merlin's Magic Land | Lelant, Cornwall, England, United Kingdom | - | ≤ | - |
| | Miami Beach Amusement Park | Port Talbot, Neath Port Talbot, Wales, United Kingdom | - | ≤ | - |
| | Midlands Industrial Exhibition | Nottingham, Nottinghamshire, England, United Kingdom | - | | - |
| | Midlothian Snowsports Centre | Edinburgh, Edinburgh, Scotland, United Kingdom | Operating | s | 1 |
| | National Garden Festival | Gateshead, Tyne and Wear, England, United Kingdom | - | | - |
| Needles Park | Alum Bay, Isle of Wight, England, United Kingdom | Operating | - | - |
| New Brighton Funfair | New Brighton, Merseyside, England, United Kingdom | Operating | ≤ | 2 |
| | New MetroLand | Gateshead, Tyne and Wear, England, United Kingdom | - | | - |
| Oakwood Theme Park | Narberth, Pembrokeshire, Wales, United Kingdom | Operating | | 5 |
| Ocean Beach Amusement Park | Rhyl, Denbighshire, Wales, United Kingdom | - | | - |
| Ocean Beach Pleasure Park | South Shields, Tyne and Wear, England, United Kingdom | Operating | ≤ | 2 |
| Old MacDonald's Farm | Brentwood, Essex, England, United Kingdom | Operating | ≤ | 1 |
| Paultons Park | Romsey, Hampshire, England, United Kingdom | Operating | | 7 |
| Pavilion Fun Park | Clacton-on-sea, Essex, England, United Kingdom | Operating | | 1 |
| Pensarn Pleasure Beach | Abergele, Conwy, Wales, United Kingdom | Operating | ≤ | - |
| | Peter Pan's Amusement Park | Ryde, Isle of Wight, England, United Kingdom | - | ≤ | - |
| | Peter Pan's Playground | Brighton, East Sussex, England, United Kingdom | - | - | - |
| Pettitts Animal Adventure Park | Reedham, Norfolk, England, United Kingdom | Operating | | 2 |
| | Pier Hill Fairground | Southend On Sea, Essex, England, United Kingdom | - | ≤ | - |
| Pirates Cove Fun Park | Shanklin, Isle of Wight, England, United Kingdom | Operating | ≤ | 1 |