Thanks all for the suggestions. No luck in DEL or BOM routing. Looks like AY inventory out of HEL to USA was phantom award space.
Ended up paying the exorbitant BA YQ for J out of BLR to LHR connection and then onwards to USA. I guess no fog issues out of BLR but not keen on them connecting in LHR in a little under 2 hours. At least it is BA to BA T5.