- 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 Windsor Hotel
- 30Machynys Peninsula Golf Club & Premier Spa
- 31Mackintosh at the Willow
- 32Madame Tussauds London
- 33Maddox Club
- 34Madison Restaurant Bar & Cafe
- 35Maenllwyd Inn
- 36Maesmawr Hall Hotel
- 37Magazine London
- 38Magicians.co.uk
- 39Magna Events
- 40Maidens Tower at Leeds Castle
- 41Majestic Hotel Eastbourne
- 42Makeney Hall Hotel
- 43Mallory Court Country House Hotel & Spa
- 44Mallyan Spout Hotel
- 45Malmaison Aberdeen
- 46Malmaison Belfast
- 47Malmaison Birmingham
- 48Malmaison Brighton
- 49Malmaison Cheltenham
- 50Malmaison Dundee
- 51Malmaison Edinburgh
- 52Malmaison Edinburgh City
- 53Malmaison Glasgow
- 54Malmaison Leeds
- 55Malmaison Liverpool
- 56Malmaison London
- 57Malmaison Manchester
- 58Malmaison Manchester Deansgate
- 59Malmaison Newcastle
- 60Malmaison Oxford
- 61Malmaison Reading
- 62Malmaison York
- 63Malt House
- 64Malt Shovel Inn
- 65Malthouse Farm
- 66Maltsters Arms
- 67Maltsters, Llandaff
- 68Maltsters, Whitchurch
- 69Manahatta Deansgate - Manchester
- 70Manahatta Edinburgh
- 71Manahatta Greek Street - Leeds
- 72Manahatta Headingley - Leeds
- 73Manahatta Merrion Street - Leeds
- 74Manahatta Newcastle
- 75Manahatta Nottingham
- 76Manahatta Parliament Street - Harrogate
- 77Manahatta Sheffield
- 78Manahatta Temple Street - Birmingham
- 79Manahatta York
- 80Manchester Airport Stanley Hotel | Signature Collection by Best Western
- 81Manchester Marriott Piccadilly Hotel
- 82Manchester Marriott Victoria & Albert Hotel
- 83Manchester South Hotel | Sure Collection by Best Western
- 84Manchester United Football Club - Old Trafford
- 85Manchester United Women's Football Club
- 86Manchester235
- 87Mandarin Oriental Hyde Park
- 88Mandeville Hotel
- 89Mango Tree
- 90Manor By The Lake
- 91Manor Farm, Worcester
- 92Manor House Hotel
- 93Mansion House Edinburgh Zoo
- 94Mansion House Harvester
- 95Maple Restaurant & Bar
- 96Marco Pierre White Steakhouse Birmingham
- 97Marco's at the Old Red Lion
- 98Marco's New York Italian Birmingham Airport
- 99Marco's New York Italian Sheffield
- 100Mare & Colt
- 101Marine Hotel Llandudno
- 102Marine Hotel Paignton
- 103Maritime Museum Liverpool
- 104Market House
- 105Market Rasen Racecourse
- 106Market Rasen/Rowley Mile Racecourse
- 107Market Tavern
- 108Marks Tey Hotel
- 109Marlborough Arms
- 110Marlborough Head
- 111Marquis of Granby
- 112Marsh Farm Hotel
- 113Marton Mere Holiday Village
- 114Marwell Hotel
- 115Mary Janes Bar
- 116Marylebone Cricket Club
- 117MASH London
- 118Masons Arms, Ramsbottom
- 119Master Mariner
- 120Match Bar
- 121Maxwell’s Bar & Grill
- 122Maybush Inn
- 123Mayflower Hotel
- 124Mayfly, Folkestone
- 125Maze Gordon Ramsay
- 126Maze Grill Gordon Ramsay
- 127Meadow Farm, Redditch
- 128Mentmore Golf & Country Club
- 129Meon Valley Hotel & Country Club
- 130Meon Valley Marriott Hotel & Country Club
- 131Mercedes-Benz World
- 132Mercure Aberdeen Caledonian Hotel
- 133Mercure Altrincham Bowdon Hotel
- 134Mercure Ayr Hotel
- 135Mercure Bedford Centre Hotel
- 136Mercure Bewdley the Heath Hotel, Kidderminster
- 137Mercure Birmingham West Hotel
- 138Mercure Blackburn Dunkenhalgh Hotel and Spa
- 139Mercure Blackburn Foxfields Country Hotel
- 140Mercure Bolton Georgian House Hotel
- 141Mercure Bournemouth Queens Hotel & Spa
- 142Mercure Bradford, Bankfield Hotel
- 143Mercure Brandon Hall Hotel & Spa, Warwickshire
- 144Mercure Bridgwater Hotel
- 145Mercure Brighton Seafront Hotel
- 146Mercure Bristol Brigstow Hotel
- 147Mercure Bristol Grand Hotel
- 148Mercure Bristol Holland House Hotel
- 149Mercure Bristol North, The Grange Hotel
- 150Mercure Cardiff North Hotel
- 151Mercure Chester Abbots Well Hotel
- 152Mercure Chester North Woodhey House Hotel
- 153Mercure Darlington Kings Hotel
- 154Mercure Dartford Brands Hatch Hotel and Spa
- 155Mercure Daventry Court Hotel
- 156Mercure Dorking White Horse Hotel
- 157Mercure Exeter Southgate Hotel
- 158Mercure Farnham Bush Hotel
- 159Mercure George Hotel Reading
- 160Mercure Glasgow City Hotel
- 161Mercure Gloucester, Bowden Hall Hotel
- 162Mercure Hatfield Oak Hotel
- 163Mercure Haydock Hotel
- 164Mercure Hotel Newport
- 165Mercure Hotel Nottingham City Centre
- 166Mercure Hull Grange Park Hotel
- 167Mercure Inverness Hotel
- 168Mercure Leeds Parkway Hotel
- 169Mercure Liverpool Atlantic Tower Hotel
- 170Mercure Livingston Hotel
- 171Mercure London Bloomsbury
- 172Mercure London Bridge Hotel
- 173Mercure London City Bankside
- 174Mercure London Hyde Park
- 175Mercure London Kensington
- 176Mercure London Paddington
- 177Mercure London Staines Upon Thames Hotel
- 178Mercure Maidstone Great Danes Hotel
- 179Mercure Manchester Norton Grange Hotel and Spa
- 180Mercure Manchester Piccadilly Hotel
- 181Mercure Milton Keynes Hotel
- 182Mercure Milton Keynes Hotel
- 183Mercure Newbury Elcot Park Hotel
- 184Mercure Northampton Town Centre
- 185Mercure Norton Grange Hotel & Spa
- 186Mercure Norwich Hotel
- 187Mercure Nottingham Sherwood Hotel
- 188Mercure Oxford Eastgate Hotel
- 189Mercure Oxford Hawkwell House
- 190Mercure Paignton Hotel
- 191Mercure Perth Hotel
- 192Mercure Salisbury White Hart Hotel
- 193Mercure Sheffield Kenwood Hall & Spa
- 194Mercure Sheffield Parkway Hotel
- 195Mercure Sheffield St Paul's Hotel and Spa
- 196Mercure St Albans Noke Hotel
- 197Mercure Stafford South Hatherton House Hotel
- 198Mercure Stratford-upon-Avon Shakespeare Hotel
- 199Mercure Swansea
- 200Mercure Tankersley Manor
- 201Mercure Telford Centre Hotel
- 202Mercure Telford Madeley Court Hotel
- 203Mercure Tunbridge Wells Hotel
- 204Mercure Wetherby Hotel
- 205Mercure York Fairfield Manor Hotel
- 206Mere Court Hotel & Conference Centre
- 207Merlins Cave
- 208Merrie Garden, Sandown
- 209Merrie Harrier
- 210Merrist Wood Golf Club
- 211Metropolitan Bushey
- 212Mews of Mayfair
- 213Mharsanta Restaurant & Bar
- 214MIC Hotel and Conference Centre
- 215Middlemore Farm, Daventry
- 216Middlethorpe Hall & Spa
- 217Middletons Hotel
- 218Milford Golf Club
- 219Mill Farm, Cannock
- 220Mill Green Golf Club
- 221Mill Hotel
- 222Mill Inn
- 223Mill Rythe Holiday Village
- 224Millennium Gloucester Hotel London Kensington
- 225Millennium Hotel London Knightsbridge
- 226Millennium Point
- 227Millennium Stadium
- 228Millers Bar and Restaurant
- 229Millers Hotel, Sibson
- 230Millstone at Mellor
- 231Milnes Bar
- 232Milton Hill House
- 233Ministry of Sound
- 234Minster Mill
- 235Mint Leaf Lounge & Restaurant
- 236Mint Leaf Restaurant & Bar
- 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 Sheffield
- 256Mosimann's
- 257Motcombs Restaurant
- 258Moti Mahal Restaurant
- 259Motley Manchester
- 260Motorpoint Arena Cardiff
- 261Motown Bristol at Delta Hotel by Marriott Bristol
- 262Motown Manchester at Hilton Manchester Deansgate
- 263Mottram Hall
- 264Mount Pleasant Ecological Park
- 265Mount Royal Hotel Edinburgh
- 266Mour Hotel
- 267Movida London
- 268Moyse's Hall
- 269Moyse's Hall
- 270Mozzarella Joes
- 271Mr Mulligans Birmingham
- 272Mr Mulligans Bournemouth
- 273Mr Mulligans Cheltenham
- 274Mr Mulligans Milton Keynes
- 275Mr Mulligans Newcastle
- 276Mr Mulligans Stevenage
- 277MSI - Museum of Science and Industry
- 278Mulberry
- 279Mulberry Bush
- 280Mulberry House
- 281Mundy Arms
- 282Municipal Hotel Liverpool - MGallery
- 283Murano Restaurant
- 284Murrayfield Stadium
- 285Murraypark Hotel
- 286Murrayshall Hotel & Golf Courses
- 287Museum & Art Gallery on The Strand
- 288Museum & Art Gallery on The Wardwick
- 289Museum of Liverpool
- 290Museum Of London
- 291Museum Of London Docklands
- 292Museum of Making at Derby Silk Mill
- 293Museum of The Order of St John
- 294Museum Tavern
- 295MusicRoomSpaceEvents
- 296Mustard Bar, Lounge & Restaurant
- 297Muthu Belstead Brook Hotel
- 298Muthu Clumber Park Hotel & Spa
- 299Muthu Glasgow River Hotel
- 300Muthu Newton Hotel
- 301Muthu Westcliff Hotel
- 302myhotel Bloomsbury
- 303myhotel Brighton
- 304myhotel Chelsea
- 305Myton House Farm, Stockton On Tees
