I dined early on a Saturday and as I was solo, I was seated at the bar. I was given a papadum and it had a hair in it. I mentioned this and received a new one. When I received the bill I was a bit surprised that they hadn't taken off anything as a way of apologising... it is gross receiving food with hair in it!
I come from Australia and on the odd chance something like that happened, it is customary for a discount of some kind to be applied.
The restaurant was lovely, however it was very expensive for Indian food.