Get off your high horse
Tongue in cheek
Spill the beans
Cat got your tongue
Wet blanket
Knock your socks off
For the birds
All thumbs
Jump the gun
Driving me up the wall
Bad Blood
A good seeing to
As much use as an ashtray on a motorbike
Away with the faeries
Barking mad
Bully for you
Gone for a Burton
Gone up the spout
Lovely jubbly
Over egging the pudding
Mad as a hatter.
Don't get your knickers in a twist .
Don't get in a swivet .
Myrab51