I am more sensitive than most, given that my daughter is profoundly deaf. Although she is not a BSL user, I don't think its appropriate in this day and age to describe the use of BSL as "waved his hands about like those people who interpret speeches in deaf-and-dumb language". You'd think an editor somewhere in the telegraph would have noticed. The comment is about 2/3rds of the way down.
www.telegraph.co.uk/comment/columnists/charlesmoore/7633411/General-Election-2010-The-strange-death- of-the-election-interview.html?state=target