Show up most nights at Mumbai at about 9 pm and see the holds, aimless vectors, etc. I have spent 40 minutes wandering around; another time coming from Bangalore, I was told to do a 360. I asked coming out of the turn to begin holding at present position. An hour later, I was advised to leave the hold, Mumbai was ready to accept us. Then I got the vectors to nowhere for 30 minutes. So, LHR ain't so bad!
GF