MPs who squeal too loudly about the proposed constituency boundary changes risk alienating voters even further from support for the three main parties. Our current Electoral Quota, the number of electors for each MP, has been described as 'off the scale' of international democratic standards by electoral expert Dr Michael Pinto-Duschinsky. Many advanced democracies have an EQ of +/- 3%; the government proposals are more moderate, seeking to bring this within +/- 5%. It's not ideal, but a good start, and achievable before the next election.
The reported sycnchonised whine by Conservative MPs that it makes their safe seats more marginal will be welcomed by voters. Electors want their constituencies to be marginal; it means their votes matter. It makes MPs more accountable. Squealing that the moves will detract from an MP's sense of entitlement will find no echoes amongst the public. Labour MPs will whinge that the changes reverse the Brownite perversion of 'fairness' under which socialists should enjoy preferential treatment over other voters. Again, the public will see though this easily enough.
This is another situation in which restoring public confidence in Parliament requires MPs to keep their mouths shut and get on with it. They won't, of course; their instincts for self-interest will overcome any altruistic intrusions about the greater public good.