I have to interrupt our 2 week stay in Goa (BA J + 2for1) to return to London for a rescheduled board meeting. This involves a 5 hour transit at BOM before catching the BA198 in J at 13.15. Hand luggage only should mean at least 4 hours in T2, even with a transfer from T1B factored in. How soon before the BA flight time am I likely to be allowed to access the lounge? Can any experienced users of the newish T2 advise on any other options?

Any help would be much appreciated.