Another concession might see an independent review of whether 600 MPs is the right number.

另一个让步是可以重新讨论600个议员席位是否是个合适的数字。

youdao

The vote is on a Lords amendment to the Electoral Registration and Administration Bill, postponing the boundary changes needed to reduce the number of MPs to 600 and equalise constituency electorates.

BBC: Reading the signs

The coalition government is committed to reducing the size of the House of Commons from 650 to 600 MPs at the next election.

BBC: House of Lords full, peers warn David Cameron

Frankly, I think 600 MPs is quite enough and also I think it is fair that every seat should have the same number of voters in it.

BBC: Cameron on Wales unplugged