Thanks for the discount code - it still works. If I book the 3 am bus instead of the 2 am bus - will it matter which one I actually take. I just want to get to Heathrow as close to the lounge opening. The 3 gets in at 4:30 and lounge opens at 5:30 am. I could take the next one that gets in at 5:15 am. But if I find out when I get there that it would be all right to hang out at Heathrow - am I obligated for the bus that I pick. I can arrange to pick it up at Gatwick - which I could do on the outbound to Tunis.