Originally Posted by
stifle
Any strings of letters and numbers that you may have observed are a coincidence.
The barcodes of everyone other than you will be rejected by the automatic gates at Fastrack. The agent at the manual check when scanning these will be presented with a screen saying that the person isn't eligible to use Fastrack and invited to scan their purchased Fastrack pass or select some other reason why they should be allowed through. "Guest of BA Gold/Silver" is one of the options, and presumably results in some sort of charge back to BA for the use of the facility.
If you wish to take more than your allowed one guest through Fastrack, please purchase Fastrack for them via the Heathrow website for £12.50pp.
Thanks for this. Does this mean that as a Silver flying ET I have an entitlement to one Fast Track guest in T5? If so, I was unaware of that and it solves my problem as only one of my family members would get a real benefit from fast track.