Paddle your own canoe
Paint the town red
Paper tiger
Parting shot / Parthian shot
Pass the buck
P.D.Q. - pretty damn quick
Pearls before swine
Pears for your heirs
Peeping Tom
Peg out
Pell-mell
(The) pen is mightier than the sword
(The) penny drops
Pester power
Peter out
Physician heal thyself
Pick 'n' mix
Picture paints a thousand words - A
Picture-perfect
Pie - as easy as
Pie in the sky
Piece of cake
Piece of piss
Piece of the action
Pig in a poke
Pigeon-chested
Pig's ear
Pig and whistle
Pin money
(Take with a) pinch of salt
Pipe down
Pipe dream
Piping hot
Piss and vinegar - Full of
Place for everything and everything in its place - A
Plague on both your houses - A
Plain sailing
Plates of meat
Play by ear
Play ducks and drakes
Play fast and loose
Play it again Sam
Play the giddy goat
Play the race card
Pleased as Punch
Plugged nickel
Point Percy at the porcelain
Politically correct
Point-blank
Point to point
Pommy bashing
Pond life
Pony and trap
Pop goes the weasel
Pork pies
POSH - Port out, starboard home
Pot calling the kettle black - The
Take potluck
Pound of flesh
Pour oil on troubled waters
Power corrupts; absolute power corrupts absolutely
Power dressing
Powers that be - The
Praying at the porcelain altar
Preaching to the choir
Preposterous
Press into service
Pretty kettle of fish
Prick up your ears
Prime time
Primrose path
Proof of the pudding is in the eating - The
Pull out all the stops
Pull the wool over your eyes
Pull up stakes
Pull yourself up by your bootstraps
Punch above one's weight
Push the boat out
Push the envelope
Put a damper on
Put a sock in it
Put a spanner in the works
Put on the wooden overcoat
Put on your thinking cap
Put paid to
Put the cart before the horse
Put the mockers on
Put the wood in the hole
Put up your dukes
Put your back up
Put your best foot forward
Put your nose out of joint
Pyrrhic victory