Only downside to VFG's proposal re two bags for 'fastrack' passengers is that at LHR, fastrack is rarely fast, especially in T4 where, more often than not, there is one lane open.
The head drops as you cheerfully head down the corridor after having boarding pass checked, only to find a very slow moving queue for one scanner.
Came through T3 Saturday evening and it was just the same but, rather than have people remove their shoes at first security point, they had a second and separate security check for just shoes!
Hard to understand the logic of this, to be honest. Why not simply ask for shoes to be removed at first check point.
Maybe it is me, but LHR just seems to go further and further backwards as each week of travel takes place.