I went through the Jet Centre a few years back travelling back in First from BGI. The closest you will get to a PJ experience on BA (now that the LCY-JFK flights have gone). Yes it is a small lounge and not a huge selection of food, but the small numbers of pax, the travel across the apron to the aircraft and then the exclusive use of Door 1 (for 6 people on the day I flew), with everyone else swarming up the steps to Door 2. Is there a better departure experience on the network? I don't think so