JOHN Bercow has rebuked an SNP MP who referred to peers as "ermine vermin".

The Speaker said it was not appropriate for such a comparison to be made by David Linden (Glasgow East) as the Commons debated proposals to halt moves to cut the number of MPs from 650 to 600.

Mr Linden, referring to the House of Lords as he outlined the contents of his speech, noted: "I want to use a few minutes of my time to talk about the other place along the corridor - the ermine vermin."

Conservative Huw Merriman (Bexhill and Battle) later raised a point of order, telling Mr Bercow he had been taken aback by the comment.

Mr Merriman added: "The Member for Glasgow East during his speech referred to peers as vermin in ermine.

"I believe I have actually confirmed this with the frontbench and I wonder if I could seek your advice as to whether this was unbecoming of this place."

Mr Bercow agreed it was unbecoming of the Commons and Mr Linden, adding: "It was said, as far as I can imagine, as I didn't hear it, sotto voce.

"If it was muttered inaudibly by accident, I am frankly surprised because in the short time (Mr Linden) has been a member of this place I've always thought him an articulate fellow who speaks lucidly in terms readily audible and intelligible.

"If, on the other hand, it was a deliberate ruse to blurt these words out in a manner intended not to be heard but nevertheless to be incorporated in the official report, that is unworthy of somebody of the budding aspirations and potential stature of (Mr Linden).

"I hope he will not resort to such a tactic again.

"We should, seriously, treat each other in this place with basic courtesy - and in referring to members of the (Lords), it is not appropriate to make that comparison or to draw that analogy.

"We'll leave it there for now."

In his speech, Mr Linden went on to say it is "absolutely ridiculous" the Lords - with around 800 peers - is only surpassed in size by China's National People's Congress.

He criticised the continued presence of hereditary peers, adding more widely: "I think the thing that is even more scandalous is the fact they come in, clock in, get their £300 a day tax-free and then leave."