Originally Posted by
LonLH
There is a LH fast track behind First Class check-in area. All M/M family except Swiss can use this AFAIK.
There are three security lanes in Zone K of LHR T1 used by LH, LO, OS, OU and TP.
A First Class/*Gold check-in lobby with its own security lane. A fast track security route
LonLH mentions which is around the First Class lobby for M&M FTL, *S and Business Class pax, and a security lane for the rest.
As *G the OP should be able to use the First Class/*G check-in lobby but this is sometimes slower than the other routes!