LGW, EDI, DUS, KEF, LCY (kind of), MAN, DUB, SOU, TXL (Air Berlin terminal) spring immediately to mind. Many are like LCY where there is a clearer tray swallow mechanism at the end of the belt. But suffice to say an awful lot of people still don't do it at these airports either. The difference is the (a) the scale of LHR and (b) the fact that more trays are needed at UK search procedures, many other airports are quite happy for liquids, computers and a nest of wires to stay in the main bag, whereas in LHR you best have that in 3 different trays.