... but the British system is full of idiosyncrasies. A constituency in the Western Isles, or Northern Ireland, or one of the industrial blightlands, is not going to have the same characteristics as one in Hampshire, Slough or Greater London. And apathy can be confused with despair: in a rock-solid safe seat, those who would vote against the incumbent if they had a chance of unseating him/her, may simply not bother to vote at all.
Why not insist that everone must vote - perhaps adding the option "none of the above" to the ballot form?
Australia has a system of compulsory and enforced participation in General Elections, and so does Singapore; among European countries where it is compulsory but not strictly enforced, are Belgium and (for Senate elections) France.
South America (which I think will have a very interesting and possibly bright history over the next century) has many countries where voters must take part. Using the information here, I give below a map of them:Let's start with AV, and if that doesn't winkle the people out of their sofas, let's go where so many other countries have led the way. Who knows, we may one day have a democracy.