NW1
No longer the case old boy. You may not be aware of it but your ops. will be. NATS management have seen fit to grant Concorde the RIGHT to jump the queue, NO SLOT SWAP INVOLVED (but don't talk about it).
So, although you fly by the same rules, you know you won't have to divert and therefore are at a commercial advantage over the rest of the field. The holding capabilities you quote are not those given to ATC, particularly on the Barbados run.
I wonder if NATS may now receive applications from other non-UK outfits requesting the same privilege.
CJ