Student from Mumbai-London

Hello all

I'll be travelling from Mumbai-London. I don't have my student visa in hand as yet and have fixed my temporary date of travel as Sep 10.

I'm completely lost as I want to book the ticket right now to get the best prices. Any idea which airlines will:
1. let me carry extra luggage w/o furnishing the student visa while buying the ticket (I will have it with me during travel)
2. Charge the least on change of dates
3. be the cheapest and have all the above?

I'm completely lost so hoping for enlightening replies! I'm outta ideas@

Read the T&Cs of Air India, Qatar, Jet Airways, King Fisher, Emirates, BA, Saudia.. pretty much all carriers flying out of BOM and headed westwards.

Call some of the General Sales Agent for carriers from Former Soviet Union. As a student wannabe do some own research, and then ask for clarifications

You could convince the airlines to give you a free ticket too