It's also worth mentioning that if you travel to the UK with any regularity (4 times within the past 24 months), or have a visa, you can join the
Registered Traveller scheme, which grants you access to the UK and EU automated entry lanes.
As others have pointed out, though, both VS and DL flight attendants are apt to provide a FastTrack Voucher upon request from a PM/DM customer in W/Y.