You might want to consider the 138 back from BOM. It's normally a hi-J 747 and is a much more enjoyable experience than a boring 9 hour day flight on a less than wonderful 777. On the 138, get on, got to sleep, wake up in London. Of course if you want the full Club experience then the day flight is better, but as the BOM regulars will testify the catering has to be some of the worst on the network.