Postal voting is by its nature open to abuse. It is wrong that the number of votes cast for candidates is determined in major part by party organisation of the indifferent and senile.
If able-bodied people can't be bothered to walk to a polling station, then they should lose their vote. Election officials, if requested, should visit the sick and elderly in their homes on election day so they can cast their votes. Persons who will be away from home should be able to register at other polling stations or, if abroad, at British Embassies.