I am going from T1 Domestic (EDI-LHR) to T3 (LHR-SFO) in a couple of months. My bag will be checked all the way through as the booking is on one PNR.

I will be travelling in UC so my question is should I use the Flight Connection Centre @ LHR or am I better going landside @ T1 baggage reclaim and going in via T3 departures via the HEX/walking.