Originally Posted by
Bob Saccamano
I don't see why LON has to be involved on the way to LPA. Most European carriers and AI can fly you to MAD one way from BOM. You can then book MAD-LPA and a LPA-LON flight. This will mean no issue with LON transit and no quarantine when you get back to LHR.
There aren't any issues with transiting London though. And there aren't many direct flights from BOM to Europe, so going to LHR first seems sensible to me, though if a one-stop itinerary on LH or LX is operating that could also work.