Prime Minister's Questions is becoming a "total farce", underlining the need for far-reaching reform at Westminster, Deputy Prime Minister Nick Clegg has said.

Mr Clegg said the "testosterone chest-beating" of male MPs shouting at each other at the centrepiece of the parliamentary week was an embarrassment.

Speaking on his weekly LBC radio phone-in, he said "normal" people did not watch it and would be appalled if they did.

"I think Prime Minister's Questions is increasingly becoming a total farce. I think it embarrasses Westminster," he said .

"It is sort of testosterone chest-beating people - almost invariably men - yelling at each other.

"I think any normal person doesn't watch it. If they did, they would be absolutely appalled that is the way the political class behaves.

"It is just so stuck in the nineteenth century and it is so stuck in this adversarial, yah-boo culture. It is going to have to change at some point.

"We can't carry on with a Westminster establishment and a way of doing things at Westminster which is totally out of keeping with modern Britain."

His comments echo concerns expressed by Commons Speaker John Bercow, who has repeatedly complained at the rowdy behaviour of MPs at PMQs.