| | Mason | Pat | | | |
| | Massie | Patrick | Daniel Watney | Factories, Health, Motor Trade, Offices, Retail, Warehouses | London |
| | Matheakis | Daniel | JLL | Offices, Retail | South West England |
| | Mattiuzzo | Robbie | Montagu Evans | Offices, Retail, Warehouses | East Midlands, London, South East England, West Midlands |
| | McCausland | David | Farebrother | | |
| | McCormack | Ken | Montagu Evans | Education, Factories, Health, Leisure and Hospitality, Motor Trade, Offices, Public Authority, Retail, Warehouses | Northern Ireland, Scotland |
| | McCrea | Peter | | | |
| | McDougall | Beverley | Avison Young | Education, Factories, Health, Leisure and Hospitality, Motor Trade, Offices, Public Authority, Retail, Warehouses | East Midlands, London, North East England, North West England, Northern Ireland, Scotland, South West England, Wales, West Midlands, Yorkshire and Humberside |
| | McEwan | Barry | Gerald Eve LLP | Education, Factories, Health, Leisure and Hospitality, Motor Trade, Offices, Public Authority, Retail, Warehouses | Scotland |
| | McInnes | Paul | Carron Real Estate Limited | Factories, Health, Leisure and Hospitality, Motor Trade, Offices, Public Authority, Retail, Warehouses | East Anglia, East Midlands, London, North East England, North West England, Scotland, South East England, South West England, Wales, West Midlands, Yorkshire and Humberside |
| | McKaig | Billy | WYM Rating | Factories, Health, Leisure and Hospitality, Offices, Retail, Warehouses | Scotland |
| | McMullan | Micky | Wilks Head & Eve | Education, Factories, Leisure and Hospitality, Offices, Public Authority, Retail, Warehouses | East Anglia, East Midlands, London, North East England, North West England, Scotland, South East England, South West England, Wales, West Midlands, Yorkshire and Humberside |
| | Meech | Andrew | Dalton Warner Davis LLP | Education, Offices, Retail, Warehouses | East Anglia, East Midlands, London, South East England |
| | Messiter | Paul | Gerald Eve LLP | | |
| | Midwinter | Matthew | Sanderson Weatherall LLP | Education, Factories, Leisure and Hospitality, Motor Trade, Offices, Public Authority, Retail, Warehouses | East Anglia, East Midlands, London, Scotland, South East England, South West England, West Midlands |
| | Millard | Maisie | Gerald Eve | | |
| | Mills | Keith | GL Hearn | Leisure and Hospitality, Retail | London, South East England, South West England |
| | Minnock | Thomas | | Health, Leisure and Hospitality, Offices, Public Authority, Retail, Warehouses | North West England |
| | Mitchell | callum | GL Hearn | Leisure and Hospitality, Offices, Retail, Warehouses | London |
| | Moggach | Matthew | Avison Young | Education, Leisure and Hospitality, Offices, Public Authority | Scotland |
