| Name/Location | County | Open | Close | Comment |
| P & D J GOACHER, Tovil, Maidstone | Kent | 1983 | . | Bockingford Brewery. Moved (from Bockingford) 1990 |
| PACIFIC ORIENTAL, Bishopsgate | London EC2 | 1998 | 2004 | Restaurant brewery. Beers filtered & served under gas pressure |
| PACKHORSE, Ashford | Kent | 1990 | 1993 | . |
| PACKHORSE, Southsea | Hampshire | 1998 | 2004 | Plant ex Kingston. Located at The Grantham Arms PH |
| PAINE, St Neots | Cambridgeshire | 1831 | 1987 | John Bull Brewery. Acquired by Tolly Cobbold 1987 |
| PALMER, Bridport | Dorset | 1794 | . | Aka J C & R H Palmer. IFBB Member |
| Paradise | . | . | . | See Wheal Ale |
| PARADISE, Wrenbury, Nantwich | Cheshire | 2000 | . | Aka Nantwich Ales |
| PARISA, Putney | London SW15 | 1998 | 1999 | Cafe bar brewery! Beers served under gas pressure |
| PARISH, Borough-on-the-Hill | Leicestershire | 1982 | . | Located at The Stag & Hounds PH. Moved from there to The Old Brewery PH, Somerby 1992- 2003 |
| Parker & Sons | . | . | . | See Cannon |
| Parry's | . | . | . | See Jollyboat |
| PASSAGEWAY, Liverpool | Merseyside | 1994 | 2001 | See also Wapping |
| PAYN, Ramsey | Cambridgeshire | 1999 | 2001? | Plant ex Leyland |
| Payne | . | . | . | See Smiles |
| Peaches | . | . | . | See Richard Cobden's |
| Peacock Brewery | . | . | . | See Hansons |
| PEAK ALES, Bakewell | Derbyshire | Unconfirmed | . | Barn Brewery to be located on the Chatsworth Estate. Source: Quaffale - Future Breweries |
| PEAKSTONES ROCK, ? | Staffordshire | Unconfirmed | . | Source: Quaffale - Future Breweries |
| Pelham Brewery | . | . | . | See Rayments |
| PEMBROKE, Pembroke, Dyfed |
W Wales | 1994 | 2001? | . |
| PEMBROKSHIRE OWN ALES, Amroth, Llanteg | Dyfed | 1985 | 1990 | Llanteglos Brewery |
| PENNINE, Keighley | W Yorkshire | 1994 | 1994 | Brewed on Worth plant |
| PENRHOS, Kington | Worcestershire | 1977 | 1983 | . |
| PENSANS, Gulval | Cornwall | 1982 | 1985 | . |
| PETT BREWING Co, Pett | E Sussex | 1995 | 1998 | See also Forge |
| PHANTOM & FIRKIN, Loughborough | Leicestershire | 1994? | 2000 | . |
| PHANTOM & FIRKIN, Plaistow | London E13 | 1997 | 1990? | Ceased brewing/sold by D Bruce 1988? |
| PHAROAH & FIRKIN, Fulham | London SW6 | 1994 | 1999? | . |
| PHEASANT, Gestingthorpe | Essex | 1981 | 1984 | . |
| PHEASANT & FIRKIN, Islington | London EC1 | 1982 | 1987 | The 4th Bruce Firkin. Formerly The Old Ivy House |
| PHILANDERER & FIRKIN, Oxford | Oxfordshire | 1996 | 1997? | . |
| PHILANTHROPIST & FIRKIN, St Albans | Hertfordshire | 1994 | 1999? | . |
| PHILATELIST & FIRKIN, Bromley | Kent | 1997 | 2000 | . |
| Phillips | . | . | . | See Truman, Burton-upon-Trent |
| PHILLIPS, Marsh Gibbon | Oxfordshire | 1981 | 1986 | Located at The Greyhound PH |
| Phillips Brewery | . | . | . | See Frederick Leney |
| PHILOSOPHER & FIRKIN, Oxford | Oxfordshire | 1995 | 2000 | . |
| PHIPPS, Northampton | Northamptonshire | 1817 | 1974 | Acquired by Watneys 1960 |
| PHOENIX, Heywood | Gtr Manchester | 1982 | . | Moved from Ellesmere Port 1991. Name changed from Oak Brewing Co 1996 |
| PHOENIX, Northampton | Northamptonshire | 1856 | 1973 | Acquired by Watneys 1960. Site sold to Carlsberg |
| PHOENIX & FIRKIN, Camberwell | London SE5 | 1984 | 1999? | The 7th Bruce Firkin - at Denmark Hill railway station |
| Phoenix Brewery | . | . | . | See Frederick Leney |
| PHOTOGRAPHER & FIRKIN, Ealing | London W3 | 1995 | 2000 | . |
| PHYSICIAN & FIRKIN, Edinburgh | Lothian | 1994 | 2000 | . |
| PICKS, Accrington | Lancashire | 1998 | 2004 | Moved from Red Lion, Green Howarth 2000 |
| PICTISH, Rochdale | Lancashire | 2000 | . | Plant ex Freelance & Firkin, Dundee. Contract brews for Old Wheelton |
| Pier Hotel | . | . | . | See Hilton |
| PIG & WHISTLE, Glasgow | Strathclyde | 1984 | 1986 | . |
| PIG & WHISTLE, Privett | Hampshire | 1982 | 1985 | Aka Southern Brewers. See also Privett |
| Pig on the Hill | . | . | . | See Country Life |
| PILGRIM, Reigate | Surrey | 1982 | . | Moved from Woldingham 1985. Also brews for Grimesdale |
| Pimlico & Bloomsbury Brewing Co | . | . | . | See Orange and Yorkshire Grey |
| Pinchinthorpe Hall | . | . | - | See North Yorkshire |
| Pinfold | . | . | . | See Cestrian |
| Pioneer | . | . | . | See Roosters |
| PITFIELD, 14, Pitfield Street | London N1 | 1996 | . | Aka The Beer Shop/London Beer Co. Contract brews for Canuk |
| PITFIELD, Hoxton Square | London N1 | 1981 | 1989 | Moved from Two Brewers Off Licence 1982 & The Beer Shop 1986 |
| PLANETS, Woking | Surrey | 1996 | 1999 | Leisure complex brewery! aka Brooklands & H G Wells |
| PLASSEY, Eyton, Wrexham, Clwyd | N E Wales | 1985 | . | . |
| Plough Inn, Bodicote | . | . | - | See Bodicote |
| Plough Inn, Coldharbour | . | . | . | See Leith Hill |
| Plough Inn, Radford | . | . | . | See Nottingham |
| Plough Inn, Winstanlow | . | . | . | See Wood |
| PLYMOUTH, Plymouth | Devon | Reg 1889 | 1983 | Regent Brewery. Acquired by Courage 1970 |
| POACHER'S, Swinderby | Lincolnshire | 2001 | . | Aka Poacher's Off Licence & Brewery |
| POINTS WEST, Devonport, Plymouth | Devon | 2000 | . | Brewery at Plymouth College of Further education |
| POLLARD, Reddish Vale, Stockport | Gtr Manchester | 1975 | 1982 | . |
| POOLE, Poole | Dorset | 1980 | 2002 | Aka Brewhouse |
| PORT MAHON, Sheffield | S Yorkshire | 2001 | . | Located at The Cask & Cutler PH |
| PORTCHESTER, Portchester, Fareham | Hampshire | 2000 | . | . |
| PORTER, Haslingden | Lancashire | 1994 | . | Rossendale Brewery at the Griffin Inn |
| PORTERHOUSE, Dublin | Ireland | 1996? | . | Beers served under gas pressure |
| Porterquack Ales | . | . | . | See Becketts |
| Porters | . | . | . | See Nethergate |
| Pot Kiln | . | . | . | See West Berkshire |
| POTBELLY, Kettering | Northamptonshire | Unconfirmed | . | Source: Quaffale - Future Breweries |
| Potters | . | . | . | See Olde Bull & Bush |
| POTTON, Potton, Sandy | Bedfordshire | 1998 | . | . |
| Powell | . | . | . | See Sam Powell & Woods |
| Powerhouse | . | . | . | See Wentworth |
| POWYS, Newtown, Powys | Mid Wales | 1981 | 1982 | Plant & Brands bought by Sam Powell |
| PREMIER ALES, Stourbridge | W Midlands | 1988 | 1991 | Plant ex Hawthorne. Brewed for Pitfield/Wiltshire/Chainmaker Wholesalers |
| Preston Brook | . | . | . | See Bass, Runcorn |
| PRESTON, Preston | Lancashire | 1992 | 1994 | Aka Atlas |
| Prince of Wales, Battersea | . | . | . | See Battersea |
| Prince of Wales, Foxfield | . | . | . | See Foxfield |
| Prince of Wales, Green Tye | . | . | . | See Green Tye |
| Prince of Wales, Princetown | . | . | . | See Princetown |
| Prince of Wales, Sheffield | . | . | . | See Frog & Parrot |
| PRINCETOWN, Princetown | Devon | 1994 | . | Located at The Prince of Wales PH |
| PRIORY, Newark-on-Trent | Nottinghamshire | 1980 | 1983 | Plant & site ex Westcrown |
| PRIVETT, Privett | Hampshire | 1985 | 1987 | Plant & site rented from former Pig & Whistle. Aka Lawns? |
| PURITY, Spernall | Warwickshire | Unconfirmed | . | Source: Quaffale - Future Breweries |
| PURPLE MOOSE, Portmadog, Gwynedd | N W Wales | Unconfirmed | . | Contract brewed by Moor at present. Source: Quaffale - Future Breweries & New Imbiber No.4 |