- 1M by Montcalm
- 2M Shed
- 3M40 J15 Warwick Hotel
- 4Macdonald Alveston Manor Hotel
- 5Macdonald Aviemore Resort
- 6Macdonald Bath Spa Hotel
- 7Macdonald Bear Hotel
- 8Macdonald Berystede Hotel
- 9Macdonald Botley Park Hotel
- 10Macdonald Burlington Hotel
- 11Macdonald Cardrona Hotel Golf & Spa
- 12Macdonald Compleat Angler
- 13Macdonald Craxton Wood Hotel
- 14Macdonald Crutherland House
- 15Macdonald Drumossie Hotel
- 16Macdonald Elmers Court Hotel & Resort
- 17Macdonald Frimley Hall Hotel & Spa
- 18Macdonald Hill Valley Hotel Golf & Spa
- 19Macdonald Houstoun House
- 20Macdonald Inchyra Hotel & Spa
- 21Macdonald Kilhey Court
- 22Macdonald Leeming House
- 23Macdonald Linden Hall Hotel
- 24Macdonald New Blossoms Hotel
- 25Macdonald Norwood Hall Hotel
- 26Macdonald Old England Hotel & Spa
- 27Macdonald Pittodrie House
- 28Macdonald Portal Hotel, Golf & Spa
- 29Macdonald Tickled Trout Hotel
- 30Macdonald Windsor Hotel
- 31Machynys Peninsula Golf Club & Premier Spa
- 32Mackintosh at the Willow
- 33Madame Tussauds London
- 34Maddox Club
- 35Madison Restaurant Bar & Cafe
- 36Maenllwyd Inn
- 37Maesmawr Hall Hotel
- 38Magazine London
- 39Magicians.co.uk
- 40Magna Events
- 41Maidens Tower at Leeds Castle
- 42Majestic Hotel Eastbourne
- 43Makeney Hall Hotel
- 44Mallory Court Country House Hotel & Spa
- 45Mallyan Spout Hotel
- 46Malmaison Aberdeen
- 47Malmaison Belfast
- 48Malmaison Birmingham
- 49Malmaison Brighton
- 50Malmaison Dundee
- 51Malmaison Edinburgh
- 52Malmaison Glasgow
- 53Malmaison Leeds
- 54Malmaison Liverpool
- 55Malmaison Manchester
- 56Malmaison Newcastle
- 57Malmaison Oxford
- 58Malmaison Reading
- 59Malmaison York
- 60Malt House
- 61Malt Shovel Inn
- 62Malthouse Farm
- 63Maltsters Arms
- 64Maltsters, Llandaff
- 65Maltsters, Whitchurch
- 66Manahatta Deansgate - Manchester
- 67Manahatta Edinburgh
- 68Manahatta Greek Street - Leeds
- 69Manahatta Headingley - Leeds
- 70Manahatta Merrion Street - Leeds
- 71Manahatta Newcastle
- 72Manahatta Nottingham
- 73Manahatta Parliament Street - Harrogate
- 74Manahatta Sheffield
- 75Manahatta Temple Street - Birmingham
- 76Manahatta York
- 77Manchester Airport Stanley Hotel | Signature Collection by Best Western
- 78Manchester Marriott Piccadilly Hotel
- 79Manchester Marriott Victoria & Albert Hotel
- 80Manchester South Hotel | Sure Collection by Best Western
- 81Manchester United Football Club - Old Trafford
- 82Manchester United Women's Football Club
- 83Manchester235
- 84Mandarin Oriental Hyde Park
- 85Mandeville Hotel
- 86Mango Tree
- 87Manor By The Lake
- 88Manor Farm, Worcester
- 89Manor House Hotel
- 90Mansion House Edinburgh Zoo
- 91Mansion House Harvester
- 92Maple Restaurant & Bar
- 93Marco Pierre White Steakhouse Birmingham
- 94Marco's at the Old Red Lion
- 95Marco's New York Italian Birmingham Airport
- 96Marco's New York Italian Sheffield
- 97Mare & Colt
- 98Marine Hotel Llandudno
- 99Marine Hotel Paignton
- 100Maritime Museum Liverpool
- 101Market House
- 102Market Rasen Racecourse
- 103Market Rasen/Rowley Mile Racecourse
- 104Market Tavern
- 105Marks Tey Hotel
- 106Marlborough Arms
- 107Marlborough Head
- 108Marquis of Granby
- 109Marsh Farm Hotel
- 110Marton Mere Holiday Village
- 111Marwell Hotel
- 112Mary Janes Bar
- 113Marylebone Cricket Club
- 114MASH London
- 115Masons Arms, Ramsbottom
- 116Master Mariner
- 117Match Bar
- 118Maxwell’s Bar & Grill
- 119Maybush Inn
- 120Mayflower Hotel
- 121Mayfly, Folkestone
- 122Maze Gordon Ramsay
- 123Maze Grill Gordon Ramsay
- 124Meadow Farm, Redditch
- 125Mentmore Golf & Country Club
- 126Meon Valley Hotel & Country Club
- 127Meon Valley Marriott Hotel & Country Club
- 128Mercedes-Benz World
- 129Mercure Aberdeen Caledonian Hotel
- 130Mercure Altrincham Bowdon Hotel
- 131Mercure Ayr Hotel
- 132Mercure Bedford Centre Hotel
- 133Mercure Bewdley the Heath Hotel, Kidderminster
- 134Mercure Birmingham West Hotel
- 135Mercure Blackburn Dunkenhalgh Hotel and Spa
- 136Mercure Blackburn Foxfields Country Hotel
- 137Mercure Bolton Georgian House Hotel
- 138Mercure Bournemouth Queens Hotel & Spa
- 139Mercure Bradford, Bankfield Hotel
- 140Mercure Brandon Hall Hotel & Spa, Warwickshire
- 141Mercure Bridgwater Hotel
- 142Mercure Brighton Seafront Hotel
- 143Mercure Bristol Brigstow Hotel
- 144Mercure Bristol Grand Hotel
- 145Mercure Bristol Holland House Hotel
- 146Mercure Bristol North, The Grange Hotel
- 147Mercure Cardiff North Hotel
- 148Mercure Chester Abbots Well Hotel
- 149Mercure Chester North Woodhey House Hotel
- 150Mercure Darlington Kings Hotel
- 151Mercure Dartford Brands Hatch Hotel and Spa
- 152Mercure Daventry Court Hotel
- 153Mercure Dorking White Horse Hotel
- 154Mercure Edinburgh City - Princes Street 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 Hythe Imperial Hotel & Spa
- 166Mercure Inverness Hotel
- 167Mercure Leeds Parkway Hotel
- 168Mercure Liverpool Atlantic Tower Hotel
- 169Mercure Livingston Hotel
- 170Mercure London Bloomsbury
- 171Mercure London Bridge Hotel
- 172Mercure London City Bankside
- 173Mercure London Hyde Park
- 174Mercure London Kensington
- 175Mercure London Paddington
- 176Mercure London Staines Upon Thames Hotel
- 177Mercure Maidstone Great Danes Hotel
- 178Mercure Manchester Norton Grange Hotel and Spa
- 179Mercure Manchester Piccadilly Hotel
- 180Mercure Milton Keynes Hotel
- 181Mercure Milton Keynes Hotel
- 182Mercure Newbury Elcot Park Hotel
- 183Mercure Northampton Town Centre
- 184Mercure Norton Grange Hotel & Spa
- 185Mercure Norwich Hotel
- 186Mercure Nottingham Sherwood Hotel
- 187Mercure Oxford Eastgate Hotel
- 188Mercure Oxford Hawkwell House
- 189Mercure Paignton Hotel
- 190Mercure Perth Hotel
- 191Mercure Salisbury White Hart Hotel
- 192Mercure Sheffield Kenwood Hall & Spa
- 193Mercure Sheffield Parkway Hotel
- 194Mercure Sheffield St Paul's Hotel and Spa
- 195Mercure St Albans Noke Hotel
- 196Mercure Stafford South Hatherton House Hotel
- 197Mercure Stratford-upon-Avon Shakespeare Hotel
- 198Mercure Swansea
- 199Mercure Tankersley Manor
- 200Mercure Telford Centre Hotel
- 201Mercure Telford Madeley Court Hotel
- 202Mercure Tunbridge Wells Hotel
- 203Mercure Wetherby Hotel
- 204Mercure York Fairfield Manor Hotel
- 205Mere Court Hotel & Conference Centre
- 206Merlins Cave
- 207Merrie Garden, Sandown
- 208Merrie Harrier
- 209Merrist Wood Golf Club
- 210Metropolitan Bushey
- 211Mews of Mayfair
- 212Mharsanta Restaurant & Bar
- 213MIC Hotel and Conference Centre
- 214Middlemore Farm, Daventry
- 215Middlethorpe Hall & Spa
- 216Middletons Hotel
- 217Milford Golf Club
- 218Mill Farm, Cannock
- 219Mill Green Golf Club
- 220Mill Hotel
- 221Mill Inn
- 222Mill Rythe Holiday Village
- 223Millennium Gloucester Hotel London Kensington
- 224Millennium Hotel London Knightsbridge
- 225Millennium Point
- 226Millennium Stadium
- 227Millers Bar and Restaurant
- 228Millers Hotel, Sibson
- 229Millstone at Mellor
- 230Milnes Bar
- 231Milton Hill House
- 232Ministry of Sound
- 233Minster Mill
- 234Mint Leaf Lounge & Restaurant
- 235Mint Leaf Restaurant & Bar
- 236Missenden Abbey
- 237Mitton Hall
- 238MK Dons Football Club
- 239Moddershall Oaks Country Spa Retreat
- 240Modello Yeovil
- 241Modern Life Cafe
- 242Moka Crawley
- 243Moka Lincoln
- 244Molineux Stadium – Wolverhampton Wanderers FC
- 245Momo
- 246Monachty
- 247Monkey Island Estate
- 248Monkfield Arms, Cambourne
- 249Moon & Sixpence
- 250Moor Park Mansion
- 251Moot House Social Club
- 252Morden Hall
- 253More Bar and Brasserie
- 254Morecambe Football Club
- 255Mosborough Hall Hotel
- 256Mosimann's
- 257Motcombs Restaurant
- 258Moti Mahal Restaurant
- 259Motley Manchester
- 260Motorpoint Arena Cardiff
- 261Mottram Hall
- 262Mount Pleasant Ecological Park
- 263Mour Hotel
- 264Movida London
- 265Moyse's Hall
- 266Moyse's Hall
- 267Mozzarella Joes
- 268Mr Mulligans Birmingham
- 269Mr Mulligans Bournemouth
- 270Mr Mulligans Cheltenham
- 271Mr Mulligans Milton Keynes
- 272Mr Mulligans Newcastle
- 273Mr Mulligans Stevenage
- 274MSI - Museum of Science and Industry
- 275Mulberry
- 276Mulberry Bush
- 277Mulberry House
- 278Mundy Arms
- 279Municipal Hotel Liverpool - MGallery
- 280Murano Restaurant
- 281Murrayfield Stadium
- 282Murraypark Hotel
- 283Murrayshall Hotel & Golf Courses
- 284Museum & Art Gallery on The Strand
- 285Museum & Art Gallery on The Wardwick
- 286Museum of Liverpool
- 287Museum Of London
- 288Museum Of London Docklands
- 289Museum of Making at Derby Silk Mill
- 290Museum of The Order of St John
- 291Museum Tavern
- 292MusicRoomSpaceEvents
- 293Mustard Bar, Lounge & Restaurant
- 294Muthu Belstead Brook Hotel
- 295Muthu Clumber Park Hotel & Spa
- 296Muthu Glasgow River Hotel
- 297Muthu Newton Hotel
- 298Muthu Westcliff Hotel
- 299myhotel Bloomsbury
- 300myhotel Brighton
- 301myhotel Chelsea
- 302Myton House Farm, Stockton On Tees
