Please let me know of any corrections or anything that is unclear to you, so I can edit these posts for other travellers' benefit.

Before someone else points out the obvious: there is no lounge at T5C so eligible passengers are able to spend £15 in Starbucks instead. Using the passageways in theory allows any eligible passenger with time on their hands to fill their boots and return to (say) T5A. However the Starbucks arrangement is a good alternative for those of us on a tight connection, and I for one will be very, very disappointed if the facility is withdrawn due to avaricious members of this board selfishly abusing the system.