The assumption that a change in the voting system would lead to a hung parliament is wrong. In the 1997 election the Alternative Vote would have led to Labour having a much larger majority than they enjoy at present, and even the Single Transferrable Vote would lead to a small Labour majority.
Governments, even coalition ones, have to face the electorate. If people do not want a Labour/Liberal Democrat coalition then the obvious response is to vote Conservative.
GRAHAM RICHARD POINTER
St Andrews, Fife