Tomorrow, I am giving a photo talk to Leamington Spa Photographic Society. I am to dispel a few myths about UK sea life and outline the challenges which face underwater shooters in our green waters. I hope that I can show some of my favourite images and compare the techniques beloved of underwater photographers with those used above water. Well, I trust the audience will still be awake after my two-and-a-half hours! Oddfellowes Hall, Leamington Spa, 7.30pm (Tue 26-11-13).