The number of seats rose from 646 at the 2005 general election after proposals made by the boundary commissions for England, Wales and Northern Ireland were adopted through statutory instruments.
Jumlah kursi bertambah dari 646 pada pemilu 2005 setelah rencana komisi perbatasan Inggris, Wales, dan Irlandia Utara diadopsi melalui instrumen undang-undang.