The representation in the US seems small in comparison with ours, but of course each state has its own congress and senate who have much more power than our local authorities, which is why murderers may be executed in Texas but not in Massachussets.
At presnt some English constituences have over 90k electors whilst other have about 50k. In Wales Arfon ( wherever that is ) has only 41k. so some redrawing is needed.