Originally Posted by
Tobias-UK
EDIT FOR CLARITY: Connecting from an international flight at Edinburgh or Glasgow Airport requires the passenger to exit the international arrival area, go through passport control, and then re-enter main security. At Manchester and Heathrow passengers do not normally need to clear the border, only security before heading to the main departure area.
International to domestic connections always require you to go through immigration. In both T2 and T5 at LHR there are separate channels for those connecting to domestic and CTA flights. You then proceed to security after this.