absolutely no need to cancel; I flew through there a couple weeks ago and the security was the most efficient I've seen in a long time: they now allow two bags, no stupid shoes off, and a world-first no-need-to-take-your-laptop-out-Sir. I flew through LHR at least 8-10 times last year and true, it was annoying, but the lounge made up for it; I'm sure with the security improvement and T5 coming up in a couple months, it's all getting better
dv