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Page last updated at 16:59 GMT, Sunday, 31 July 2011 17:59 UK

Musical chairs

Commons chamber
The number of MPs will be reduced to around 600

The prospect of fighting the next election under new Parliamentary boundaries always makes MPs feel anxious.

Nothing unusual about that - the boundary commissions of England, Scotland, Wales and Northern Ireland are required to look at whether constituencies need changing to take account of population changes.

The reason why the next boundary review will be even more nerve wracking for MPs is that the number of seats is being cut - from 650 to 600.

Another big change is that constituencies will be made more equal in terms of the number of voters they contain.

I've been talking to two leading authorities on the subject - Rob Hayward, who has advised the Conservatives on boundaries, and Lewis Baston, a Labour supporter.

Labour MPs complain the biggest reduction in seats will be in areas where Labour is strong such as Scotland, Wales and English cities. I asked Rob Hayward - is that true?

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