I am about to book a flight from HKG-BOM-LHR with CX and the BA all in Business class. I know this is slightly OT but if I book all of the tickets on one booking, and my layover in Mumbai will be about 2 hours, do you think that I will still need to get a transit visa, and secondly, do you think that 2 hours is enough time to make the connection - bearing in mind that both airlines will be in T2 BOM?

Thanks a lot in advance, and thanks for tolerating the slightly OT nature of the thread!