| 12 & 12A Moore Close Freeholders Limited | Nottingham | 2015 |
| 12 & 12A Paget Avenue RTM Company Ltd | Lewes | 2017 |
| 12 & 12A ST. Mary Street Chippenham Management Company Limited | Corsham | 2008 |
| 12 & 12A Upper Market Street Freehold Company Limited | Hove | 2023 |
| 12 & 13 Briarswood Winchester Road Southampton Management Company Limited | Upham | 2005 |
| 12 & 13 Lambridge Place, Bath Limited | Bath | 2000 |
| 12 & 13 Salisbury Pavement Freehold Limited | Shrewsbury | 2017 |
| 12 & 14 Richards Place Freehold Limited | London | 2015 |
| 12 - 22 Patricia Road RTM Company Ltd | Romsey | 2026 |
| 12 14 Calvin ST Ltd | Stratford | 2018 |
| 12 Adelaide Crescent Hove Limited | Hove | 1994 |
| 12 Adelaide Grove RTM Company Limited | London | 2013 |
| 12 Aden Grove Limited | London | 2012 |
| 12 Alderson Road Management Company Limited | Ripon | 2017 |
| 12 Alexandra Park Road Freehold Company Limited | London | 2010 |
| 12 Almeida Street Management Limited | | 1988 |
| 12 Alumhurst Road RTM Company Limited | Westbourne | 2021 |
| 12 Ambra Vale East Clifton Management Company Limited | Bristol | 2003 |
| 12 Ambrose Road Management Limited | Bristol | 1985 |
| 12 Arlington Villas Flat Management Limited | East Brent | 2014 |
| 12 Ashford Road Management Limited | Gloucestershire | 1984 |
| 12 Ashley Road Management Limited | Bristol | 2014 |
| 12 Avenue Road (Management) Limited | London | 1988 |
| 12 Backfields Lane Management Company Ltd | Bristol | 2025 |
| 12 Bagdale Management Company Limited | Whitby | 2013 |
| 12 Beatrice Road Limited | London | 2009 |
| 12 Beaufort East (Bath) Limited | Bristol | 1983 |
| 12 Beaumont Road Management Company Limited | London | 2023 |
| 12 Bedford Place Brighton Limited | Brighton | 2016 |
| 12 Bedwardine Road Limited | Crystal Palace | 2012 |
| 12 Belitha Villas Limited | Sevenoaks | 1979 |
| 12 Bellevue Crescent Limited | Bristol | 2016 |
| 12 Bellevue Road (Freehold) Limited | Ramsgate | 2022 |
| 12 Belsize Park Limited | | 1998 |
| 12 Bennett Park (Freehold) Limited | London | 2024 |
| 12 Beresford Road Management Company Limited | Woking | 2019 |
| 12 Bertram Road Management Ltd | Liverpool | 2024 |
| 12 Bisham Gardens Limited | London | 1968 |
| 12 Bladud Buildings Management Company Limited | Bath | 2019 |
| 12 Blenheim Road Management Company Limited | Bristol | 1983 |
| 12 Boscombe Cliff Road Freehold Limited | Bournemouth | 2025 |
| 12 Boston Square Ltd | Bedford | 2017 |
| 12 Boyne Park Limited | Tunbridge Wells | 1989 |
| 12 Bramham Gardens Limited | London | 2002 |
| 12 Briardale Gardens Limited | | 1995 |
| 12 Brittany Road RTM Company Ltd | Hastings | 2014 |
| 12 Bruce Grove Freehold Limited | London | 2017 |
| 12 Brunswick SQ Ltd | Bristol | 2019 |
| 12 Brunswick Square Management Company Limited | Ross-On-Wye | 2004 |
| 12 Buckingham Road Brighton Limited | Worthing | 1995 |
| 12 Buckingham Street and 31-33 Kingsbury RMC Ltd | Aylesbury | 2025 |
| 12 Buer Road Management Company Limited | Hampshire | 2003 |
| 12 Burlington Road Freehold Limited | London | 2009 |
| 12 Cadogan Road Limited | Surbiton | 2019 |
| 12 Caledonia Place Management Limited | Bristol | 1980 |
| 12 Cambridge Park Limited | Bristol | 2018 |
| 12 Cambridge Street Management Company Limited | London | 1999 |
| 12 Camden Crescent (Bath) Limited | Bath | 1978 |
| 12 Campden Road Limited | Surrey | 1990 |
| 12 Canadian Avenue Limited | Exeter | 2002 |
| 12 Carlisle Avenue, ST. Albans, Herts Limited | St. Albans | 1982 |
| 12 Carlton Road Limited | London | 1999 |
| 12 Carmichael Road RTM Company Limited | Wadhurst | 2021 |
| 12 Castellain Road Management Company Limited | London | 1988 |
| 12 Castledine Road Management Limited | Melksham | 2018 |
| 12 Cato Road Management Limited | London | 2023 |
| 12 Charlotte Street Management Company Limited | Bristol | 1989 |
| 12 Charteris Road Freehold Limited | London | 2017 |
| 12 Chatsworth Road Limited | Brampton | 2006 |
| 12 Chelker Close RTM Company Limited | Bradford | 2023 |
| 12 Chichester Terrace Management Company Limited | Hove | 1999 |
| 12 Christ Church Road Management Limited | London | 2013 |
| 12 Church Street RTM Company Limited | Reigate | 2025 |
| 12 Churchill Road Owners Limited | Bournemouth | 2019 |
| 12 City Road Management Limited | Woodford Green | 2020 |
| 12 Clevedon Road Freehold Company Limited | Bridgwater | 2019 |
| 12 Cliff Road RTM Company Limited | Southend-On-Sea | 2008 |
| 12 Clyde Road Redland Management Limited | Bristol | 1998 |
| 12 Coleherne Road Limited | London | 2013 |
| 12 College Road (Brighton) Limited | | 2003 |
| 12 Collingwood Villas Management Company Limited | Plymouth | 2003 |
| 12 Colyton Road Limited | London | 2025 |
| 12 Concanon Road Limited | London | 2025 |
| 12 Connaught Place Ltd | London | 2025 |
| 12 Coolhurst Road Ltd | London | 2021 |
| 12 Coopers Lane Limited | London | 2018 |
| 12 Coral Street Limited | Saltburn-By-The-Sea | 2016 |
| 12 Cornwall Gardens Limited | London | 2003 |
| 12 Cornwallis Crescent Management Limited | Bristol | 1991 |
| 12 Corrance Road RTM Company Limited | London | 2010 |
| 12 Cowbridge RTM Company Ltd | Hertford | 2009 |
| 12 Coychurch Road Management Company Ltd | London | 2022 |
| 12 Crediton Hill Freehold Limited | London | 2005 |
| 12 Crescent Road Limited | Kingston-Upon-Thames | 2001 |
| 12 Croftdown Road Limited | | 1995 |
| 12 Croham Park Avenue RTM Company Limited | South Croydon | 2008 |
| 12 Cromwell Road Hove Limited | Hove | 2002 |
| 12 Crossley Street Freehold Limited | London | 2025 |
| 12 Culford Gardens Limited | London | 2013 |
| 12 Cumberland Street (Plymouth) Ltd | Plymouth | 2026 |