Palladium
    1914-1925
    Palladium Auto-Cars Ltd
    Lontoo

Paragon
    n. 1913
    W P Durtnall

Parker (I)
    1898-1899
    Parker Bros Ltd
    Wolverhampton

Pattison
    n. 1935-?

Pedrail
    1913
    Pedrail Transport Ltd
    Lontoo

Peerless (II)
    1925-1933
    Slough Lorries & Components Ltd
    Slough, Berkshire

Perkins
    1871-1902
    Perkins & Sons
    Lontoo

Petrol Pony
    1935-1936
    Frank Waring

PFS
    1922-1924
    Percy Frost-smith

Phillips
    n. 1903
    Charles D Phillips

Pick
    n. 1905-1924

Pickering
    1905-1906
    F G Pickering & Co Ltd
    Tweedmouth

Pioneer (I)
    1902
    Pioneer Power Co Ltd
    Lontoo

Plaxtons
    1927-
    Plaxtons Ltd
    Scarborough

Powertruck
    n. 1963

Princess
    1906
    Century Engineering Co Ltd
    Willesden, Lontoo

Proctor
    1947-1952
    Proctor Springwood Ltd
    Norwich, Norfolk

Pullcar
    1906-1909
    Pullcar Motor Co Ltd
    Preston, Lancashire

Pyrene
    n. 1970-
    Pyrene Ltd

Pyrodyne
    1904-1908
    Bickford Burners' Co
    Camborne, Cornwall