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Don't respect the security there jumped up wanna be police failures that probably got bullied at school their not here to help there here to be sarcastic and condescending :)
If you need to change GBP to Euros (or probably any other currency) NEVER use the exchange places in the airport - rip off. Type Thomas Global Exchange into Google and get a much better rate. :-)
Be prepared for a long walk to Passport Control and a long wait there. If you have one of the electronic passports use the auto-check queue - it's complicated but much faster.
Avoid security line 1, on the far right. The boarding pass check may be much faster but its where they put all the pushchair and pram families for x-ray.
If your flight is delayed, don't go to gates 101-113 unless you KNOW it has been reassigned there. It's another planet and takes light-years to get back to the main lounge.