I have a VS flight from BLR-LHR

I will arrive in BLR on an international flight from BKK Thailand, probably on a TG Thai Airways flight, but with different PNR

Does anyone have any experience of getting TG to interline to VS so my bags will be checked through to LHR ?

If they won't... I will need to clear customs at BLR , and I dont have a visa! so trying to avoid if possible.

Thanks