I will start with ;
Up the duff.
Old codger.
Silly duffer.
Clapped out .
On its last legs.
Stab in the back, as talking behind someones back.
Pilock .
Soft in the head .
He aint all there.
Lost his marbles.
Takes one to know one.
Shot away.
Pushing up daisies .
The grass is not greener.
I do know that “pillock” was originally a Scandinavian word for “■■■■■”. One word which is generally considered to be a very mild insult is “berk”, although this is actually a contraction of the Cockney rhyming slang “Berkeley Hunt”. 
Mad as a hatter
Fly as a barrel of monkeys
As old as the hills
Another one bites the dust.
Takes one to know one.
Minger.
Chav; Cheltenham ladies college, have nots.
Gone with the fairies.
Lording it up.
Geezer.
Mucker.
Shot away.
Clever Clogs.
Moron.
On your bike.
Go and do one.
Hot to trot.
Nice pair of puppies.
More meat on a butcher’s apron.
A lot of examples in modern usage stem from Shakespeares writings: Just a few - some slightly amended.... wear my heart on my sleeve neither here nor there whats done is done
as luck would have it
eaten out of house and home
whats in a name? the worlds my oyster
the long and short of it (originally the other way around)
all the world`s a stage
method in the madness
love is blind
be true to yourself
neither a borrower or lender be…and others!
Wet the whistle .
Going like the clappers.
Brown bread as in dead.
Going berserk.
Rose tinted glasses.
Slapper.
It’s gone ■■■■ up.
Malarky.
Mayhem.
Gofer as odd job man fetching the brews.
Shambles.
Off your rocker.
Harry Monk:
I do know that “pillock” was originally a Scandinavian word for “■■■■■”. One word which is generally considered to be a very mild insult is “berk”, although this is actually a contraction of the Cockney rhyming slang “Berkeley Hunt”.
My aunt, back in the 60s or early 70s when she was still only going out with her now husband, offended them by using the term “cobblers” in front of them. She didn’t realise it came from “cobblers’ awls” (balls).
Taking the ■■■■,to be fair i dont anybodys ■■■■ 
It’s gone black over bills mothers
Can’t do right for doing wrong
Alright me duck
Don’t come running to me when you’ve cut ya leg off
shurrup or i’ll give you summit to cry about
■■■■■■■:
A lot of examples in modern usage stem from Shakespeares writings: Just a few - some slightly amended.... wear my heart on my sleeve neither here nor there whats done is done
as luck would have it
eaten out of house and home
whats in a name? the worlds my oyster
the long and short of it (originally the other way around)
all the world`s a stage
method in the madness
love is blind
be true to yourself
neither a borrower or lender be…and others!
face like a welders bench
face like a box of frogs
sweet words butter no parsnips
fanny like a billposters bucket
his lift dosent go up to the penthouse
hes a bit short of lamp oil a sausage short of a fry up hes not the full shilling
hes elevenpence h/apenny
.
somehow I have my doubts that shakespear had anything to do with mine… 
Delhi belly.
Bad guts.
Gone off food.
Dodgy tummy.
Posh.
Snob.
Fruit cake as in mad.
Shirt lifter.
■■■■■■.
Dumb .
Tycoon as in wealthy.
Chugging along.
Strike industrial action.
Mentor.
Juggernaut.
Got the hump.
Hallucinations.
Frog marched.
Scooter.
High brow.
" that cute he would build a nest in your ear "
" he is like the man pushing the wheelbarrow…he has got it all in front of him "
" it was that stiff that a greyhound wouldn,t put a tooth in it "
" taking plenty of no notice "
A friends eye is a good mirror.
How long is a piece of string.
Don’t spoil the ship for a ha’penny’s worth o’ tar.
The oldest knot in a stick is the hardest to straighten.
A bit long in the tooth.
Follow your nose.
A sandwich short of a picnic.
Face like a mile of rough road.
Curiosity killed the cat.
Ten pence short of a pound.
Not the full shilling.
Give e’ a good lamb basting.
Wait ’ till the cog’s gone full circle.
Away with the fearies ( fairy’s).
And you’ll be dancin’ a merry tune.
If looks could kill.
Never count your chickens before they hatch.
Never put all your eggs in one basket.
There’s no smoke without fire.
Act in haste repent in leasure.
A stich in time saves nine.
Do you think I came up on a down train,
come up with the grass
Daft as a brush
thick as 2 short planks
He don’t know if he wants a ■■■■, shave or a haircut
Dozy pillock (self explanation for some) 
nick2008:
Dozy pillock (self explanation for some)
You are right, I got a bit carried away there 
Mooched Abaart (Wandered Around)
Bugger All / Nowt (Nothing)
Knacker Bare (Naked)
Jammy Sod (Lucky Person)
Don’t look at me in that tone of voice
If the wind changes,your face will stick like that
Th’art as much use as a man med a band. ( you’re as much use as a man made of string)