The full letter may be read on UKK41 linked here. I reprint its concluding paragraphs:
The reason why fewer and fewer people vote for the "major" political parties is not becasue of the electoral system but because British politics is morally and politically bankrupt. Most have given up voting altogether - although AV will not give the angry abstainers any box to tick! AV is a stitch up, a gross manipulation of the people in the guise of "giving them more votes". More votes means less power to the voter and more power to politicians behind the scenes - as the Condem coalition proves every day. AV has all the attributes of bad law - it is complicated, not generally understood, difficult to scutinise and therefore open to fraud, gives some voters more power than others and the rulers more power than the ruled.
To that extent it is perfectly in harmony with the petty fascist society created by the British political class, to which the British people are turning their backs in utter comtempt. A class which UKIP now foolishly seeks to join.