Thanks for the report. If it's any consolation, I am sitting on about USD50 in rupees from my trip there three years ago.
But it doesn't sound like you stopped over in DEL? I guess you've been to India before.
Which leads to my next question. Aren't you flying on a CX/UA RTW? If so, why not just fly HKG-LHR direct with CX. Not only do you get better service but avoid the layover at such an ungodly hour in DEL (or is the answer somewhere in another trip report)? Nothing kills a good sleep like stopping over for three hours in the middle of the night.