They still have a House of Lords. They havent, for decades, recounted riding populations, like we do in Canada. In Canada, we adjust, basically adding ridings to keep all of them relatively the same in population size. So Labour Party ridings have actually saw a shrinkage in population, and rightly should lose some ridings. That is to their advantage that no counting has been done.
Sorry, but you’re out of date on this. The Boundary Commission (whose job this is) is required to review the boundaries of Parliamentary constituencies every five years. Its latest recommendations, due for ratification in 2018, are radical, including the reduction in the total number of seats from 650 to 600. In England, all but 68 of the 533 constituencies will have some changes to their boundaries.