I'm trying to plan a flight for September from BLR-LHR-NYC (don't care whether it's JFK or EWR), and want any advice/experience on how long of a connection time to leave.

Pre-10Aug, a 75-minute window was always sufficient. But now I'm thinking I've got to leave at least two hours to be sure (perhaps more?) I clear security in T4.

BLR-LHR would be coming in to T4, and the LHR-NYC flights would also leave from T4. And I'll be in Club World, if that makes a difference (depends on the day of the week, at this point, it seems).