Apologies, I'd love to help, but I'm in the same boat and there's no confirmed flight that I can possibly suggest at the moment. Same as other forum members have suggested, best bet for now looks like waiting for AI flights for Frankfurt to open and jostle for a ticket on thoseThanks @mage for your detailed reply. Really appreciate.
Is there any other airline apart from AI that v can take to leave India in August?
I know Emirates is showing booking for 15th aug onwards but v cant possibly take that flight..
Another way (likely just a time-sink) maybe to try to get a remaining ticket for AI's London flight, if any travel agent is still exercising their blocking power on those - they are probably going to charge a hefty premium though, if they have any left.