I hadn't been using it for ages - just using Safari. This evening, I clicked a link from mail which opened up in Chrome (credit expert), and then I added tabs for PPrune and Daily Mail and it crashed while I was flicking through them. I had been interacting with all three sites for a few minutes before this happened. I think it may be the DM that is the culprit on Chrome - not sure if that is a flash/shockwave site or not.
Previously I had disabled shockwave through the chrome settings and this didn't stop the problem either, although as this is a new version following your previous suggestion I assume it may be back to the default.