- 1M by Montcalm
- 2M Shed
- 3M40 J15 Warwick Hotel
- 4Macdonald Alveston Manor Hotel
- 5Macdonald Aviemore Resort
- 6Macdonald Bear Hotel
- 7Macdonald Berystede Hotel
- 8Macdonald Botley Park Hotel
- 9Macdonald Burlington Hotel
- 10Macdonald Cardrona Hotel Golf & Spa
- 11Macdonald Compleat Angler
- 12Macdonald Craxton Wood Hotel
- 13Macdonald Crutherland House
- 14Macdonald Drumossie Hotel
- 15Macdonald Elmers Court Hotel & Resort
- 16Macdonald Frimley Hall Hotel & Spa
- 17Macdonald Hill Valley Hotel Golf & Spa
- 18Macdonald Houstoun House
- 19Macdonald Inchyra Hotel & Spa
- 20Macdonald Kilhey Court
- 21Macdonald Leeming House
- 22Macdonald Linden Hall Hotel
- 23Macdonald New Blossoms Hotel
- 24Macdonald Norwood Hall Hotel
- 25Macdonald Old England Hotel & Spa
- 26Macdonald Pittodrie House
- 27Macdonald Portal Hotel, Golf & Spa
- 28Macdonald Windsor Hotel
- 29Machynys Peninsula Golf Club & Premier Spa
- 30Mackintosh at the Willow
- 31Madame Tussauds London
- 32Maddox Club
- 33Madison Restaurant Bar & Cafe
- 34Maenllwyd Inn
- 35Maesmawr Hall Hotel
- 36Magazine London
- 37Magicians.co.uk
- 38Magna Events
- 39Maidens Tower at Leeds Castle
- 40Majestic Hotel Eastbourne
- 41Makeney Hall Hotel
- 42Mallory Court Country House Hotel & Spa
- 43Mallyan Spout Hotel
- 44Malmaison Aberdeen
- 45Malmaison Belfast
- 46Malmaison Birmingham
- 47Malmaison Brighton
- 48Malmaison Cheltenham
- 49Malmaison Dundee
- 50Malmaison Edinburgh
- 51Malmaison Edinburgh City
- 52Malmaison Glasgow
- 53Malmaison Leeds
- 54Malmaison Liverpool
- 55Malmaison London
- 56Malmaison Manchester
- 57Malmaison Manchester Deansgate
- 58Malmaison Newcastle
- 59Malmaison Oxford
- 60Malmaison Reading
- 61Malmaison York
- 62Malt House
- 63Malt Shovel Inn
- 64Malthouse Farm
- 65Maltsters Arms
- 66Maltsters, Llandaff
- 67Maltsters, Whitchurch
- 68Manahatta Deansgate - Manchester
- 69Manahatta Edinburgh
- 70Manahatta Greek Street - Leeds
- 71Manahatta Headingley - Leeds
- 72Manahatta Merrion Street - Leeds
- 73Manahatta Newcastle
- 74Manahatta Nottingham
- 75Manahatta Parliament Street - Harrogate
- 76Manahatta Sheffield
- 77Manahatta Temple Street - Birmingham
- 78Manahatta York
- 79Manchester Airport Stanley Hotel | Signature Collection by Best Western
- 80Manchester Marriott Piccadilly Hotel
- 81Manchester Marriott Victoria & Albert Hotel
- 82Manchester South Hotel | Sure Collection by Best Western
- 83Manchester United Football Club - Old Trafford
- 84Manchester United Women's Football Club
- 85Manchester235
- 86Mandarin Oriental Hyde Park
- 87Mandeville Hotel
- 88Mango Tree
- 89Manor By The Lake
- 90Manor Farm, Worcester
- 91Manor House Hotel
- 92Mansion House Edinburgh Zoo
- 93Mansion House Harvester
- 94Maple Restaurant & Bar
- 95Marco Pierre White Steakhouse Birmingham
- 96Marco's at the Old Red Lion
- 97Marco's New York Italian Birmingham Airport
- 98Marco's New York Italian Sheffield
- 99Mare & Colt
- 100Marine Hotel Llandudno
- 101Marine Hotel Paignton
- 102Maritime Museum Liverpool
- 103Market House
- 104Market Rasen Racecourse
- 105Market Rasen/Rowley Mile Racecourse
- 106Market Tavern
- 107Marks Tey Hotel
- 108Marlborough Arms
- 109Marlborough Head
- 110Marquis of Granby
- 111Marsh Farm Hotel
- 112Marton Mere Holiday Village
- 113Marwell Hotel
- 114Mary Janes Bar
- 115Marylebone Cricket Club
- 116MASH London
- 117Masons Arms, Ramsbottom
- 118Master Mariner
- 119Match Bar
- 120Maxwell’s Bar & Grill
- 121Maybush Inn
- 122Mayflower Hotel
- 123Mayfly, Folkestone
- 124Maze Gordon Ramsay
- 125Maze Grill Gordon Ramsay
- 126Meadow Farm, Redditch
- 127Mentmore Golf & Country Club
- 128Meon Valley Hotel & Country Club
- 129Meon Valley Marriott Hotel & Country Club
- 130Mercedes-Benz World
- 131Mercure Aberdeen Caledonian Hotel
- 132Mercure Altrincham Bowdon Hotel
- 133Mercure Ayr Hotel
- 134Mercure Bedford Centre Hotel
- 135Mercure Bewdley the Heath Hotel, Kidderminster
- 136Mercure Birmingham West Hotel
- 137Mercure Blackburn Dunkenhalgh Hotel and Spa
- 138Mercure Blackburn Foxfields Country Hotel
- 139Mercure Bolton Georgian House Hotel
- 140Mercure Bournemouth Queens Hotel & Spa
- 141Mercure Bradford, Bankfield Hotel
- 142Mercure Brandon Hall Hotel & Spa, Warwickshire
- 143Mercure Bridgwater Hotel
- 144Mercure Brighton Seafront Hotel
- 145Mercure Bristol Brigstow Hotel
- 146Mercure Bristol Holland House Hotel
- 147Mercure Bristol North, The Grange Hotel
- 148Mercure Cardiff North Hotel
- 149Mercure Chester Abbots Well Hotel
- 150Mercure Chester North Woodhey House Hotel
- 151Mercure Darlington Kings Hotel
- 152Mercure Dartford Brands Hatch Hotel and Spa
- 153Mercure Daventry Court Hotel
- 154Mercure Dorking White Horse Hotel
- 155Mercure Exeter Southgate Hotel
- 156Mercure Farnham Bush Hotel
- 157Mercure George Hotel Reading
- 158Mercure Glasgow City Hotel
- 159Mercure Gloucester, Bowden Hall Hotel
- 160Mercure Hatfield Oak Hotel
- 161Mercure Haydock Hotel
- 162Mercure Hotel Newport
- 163Mercure Hotel Nottingham City Centre
- 164Mercure Hull Grange Park Hotel
- 165Mercure Inverness Hotel
- 166Mercure Leeds Parkway Hotel
- 167Mercure Livingston Hotel
- 168Mercure London Bloomsbury
- 169Mercure London Bridge Hotel
- 170Mercure London City Bankside
- 171Mercure London Hyde Park
- 172Mercure London Kensington
- 173Mercure London Paddington
- 174Mercure Maidstone Great Danes Hotel
- 175Mercure Manchester Norton Grange Hotel and Spa
- 176Mercure Manchester Piccadilly Hotel
- 177Mercure Milton Keynes Hotel
- 178Mercure Milton Keynes Hotel
- 179Mercure Newbury Elcot Park Hotel
- 180Mercure Northampton Town Centre
- 181Mercure Norton Grange Hotel & Spa
- 182Mercure Norwich Hotel
- 183Mercure Nottingham Sherwood Hotel
- 184Mercure Oxford Eastgate Hotel
- 185Mercure Oxford Hawkwell House
- 186Mercure Paignton Hotel
- 187Mercure Perth Hotel
- 188Mercure Salisbury White Hart Hotel
- 189Mercure Sheffield Kenwood Hall & Spa
- 190Mercure Sheffield Parkway Hotel
- 191Mercure Sheffield St Paul's Hotel and Spa
- 192Mercure St Albans Noke Hotel
- 193Mercure Stafford South Hatherton House Hotel
- 194Mercure Stratford-upon-Avon Shakespeare Hotel
- 195Mercure Swansea
- 196Mercure Tankersley Manor
- 197Mercure Telford Centre Hotel
- 198Mercure Telford Madeley Court Hotel
- 199Mercure Tunbridge Wells Hotel
- 200Mercure Wetherby Hotel
- 201Mercure York Fairfield Manor Hotel
- 202Mere Court Hotel & Conference Centre
- 203Merlins Cave
- 204Merrie Garden, Sandown
- 205Merrie Harrier
- 206Merrist Wood Golf Club
- 207Metropolitan Bushey
- 208Mews of Mayfair
- 209Mharsanta Restaurant & Bar
- 210MIC Hotel and Conference Centre
- 211Middlemore Farm, Daventry
- 212Middlethorpe Hall & Spa
- 213Middletons Hotel
- 214Milford Golf Club
- 215Mill Farm, Cannock
- 216Mill Green Golf Club
- 217Mill Hotel
- 218Mill Inn
- 219Mill Rythe Holiday Village
- 220Millennium Gloucester Hotel London Kensington
- 221Millennium Hotel London Knightsbridge
- 222Millennium Point
- 223Millennium Stadium
- 224Millers Bar and Restaurant
- 225Millers Hotel, Sibson
- 226Millstone at Mellor
- 227Milnes Bar
- 228Milton Hill House
- 229Ministry of Sound
- 230Minster Mill
- 231Mint Leaf Lounge & Restaurant
- 232Mint Leaf Restaurant & Bar
- 233Mitton Hall
- 234MK Dons Football Club
- 235Moddershall Oaks Country Spa Retreat
- 236Modello Yeovil
- 237Modern Life Cafe
- 238Moka Crawley
- 239Moka Lincoln
- 240Molineux Stadium – Wolverhampton Wanderers FC
- 241Momo
- 242Monachty
- 243Monkey Island Estate
- 244Monkfield Arms, Cambourne
- 245Moon & Sixpence
- 246Moor Park Mansion
- 247Moot House Social Club
- 248Morden Hall
- 249More Bar and Brasserie
- 250Morecambe Football Club
- 251Mosborough Hall Hotel Sheffield
- 252Mosimann's
- 253Motcombs Restaurant
- 254Moti Mahal Restaurant
- 255Motley Manchester
- 256Motorpoint Arena Cardiff
- 257Motown Bristol at Delta Hotel by Marriott Bristol
- 258Motown Manchester at Hilton Manchester Deansgate
- 259Mottram Hall
- 260Mount Pleasant Ecological Park
- 261Mount Royal Hotel Edinburgh
- 262Mour Hotel
- 263Movida London
- 264Moyse's Hall
- 265Moyse's Hall
- 266Mozzarella Joes
- 267Mr Mulligans Birmingham
- 268Mr Mulligans Bournemouth
- 269Mr Mulligans Cheltenham
- 270Mr Mulligans Milton Keynes
- 271Mr Mulligans Newcastle
- 272Mr Mulligans Stevenage
- 273MSI - Museum of Science and Industry
- 274Mulberry
- 275Mulberry Bush
- 276Mulberry House
- 277Mundy Arms
- 278Municipal Hotel Liverpool - MGallery
- 279Murano Restaurant
- 280Murrayfield Stadium
- 281Murraypark Hotel
- 282Murrayshall Hotel & Golf Courses
- 283Museum & Art Gallery on The Strand
- 284Museum & Art Gallery on The Wardwick
- 285Museum of Liverpool
- 286Museum Of London
- 287Museum Of London Docklands
- 288Museum of Making at Derby Silk Mill
- 289Museum of The Order of St John
- 290Museum Tavern
- 291MusicRoomSpaceEvents
- 292Mustard Bar, Lounge & Restaurant
- 293Muthu Belstead Brook Hotel
- 294Muthu Clumber Park Hotel & Spa
- 295Muthu Glasgow River Hotel
- 296Muthu Newton Hotel
- 297Muthu Westcliff Hotel
- 298myhotel Bloomsbury
- 299myhotel Brighton
- 300myhotel Chelsea
- 301Myton House Farm, Stockton On Tees
