He was another jazz fan, allegedly he cried during the blitz when he arrived back at his digs to find all his 78 records destroyed. There's a great clip of him in the BBC studio's in the audience of a MJQ concert.
Big fan of Bill Evans, I've heard. As mentioned, he's also in the audience on 'Jazz 625' footage. He was in the specially invited studio audience too for the Rendell/Carr 'Live' at Lansdowne, apparently.
Yes, his Wikipedia entry includes the following: "Le Mesurier's favoured pastime was visiting the jazz clubs around Soho, such as The Establishment or Ronnie Scott's, and he observed that 'listening to artists like Bill Evans, Oscar Peterson or Alan Clare always made life seem that little bit brighter.'"