The thing about the new boundary changes is that they have to cope with the reduction in the HoC from 650 to 600 constituencies. So while the new constituencies will have an electorate within the 72,000 to 78,000 range, their geographical boundaries will also change, except in four cases where this is not practicable.
A bit of collective pain to rid us of 50 MPs has to be worth it. I would be prepared to suffer a lot more to get the HoC down to 300 and the HoL to 250 max.