Do I need to go through the UK Border Control if I have a connecting flight between Terminal 2 and T5 in Heathrow airport London?
Not unless you are connecting to a UK domestic flight or a flight to Dublin.
Or you need to collect and recheck your bag for some reason
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Or if they weren't able to through-check their bags (eg connection was actually on 2 different tickets from airlines that don't play nicely with each other WRT interlining) – Gagravarr Aug 11 '15 at 20:12
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