Favourite London open mic nights?

I am still pretty new to the open mic scene and I would like to know which places other performers can recommend, I know they can be a bit hit and miss in regards to having a "real" audience (as opposed to just other comedians) as you may go one week and its packed and the next no one turns up.

Is there any places that more often than not have a receptive audience and good atmosphere?

I will start by saying my favourite gig so far was at the Electric mouse, Big Ben it had a great atmosphere, a nice audience and was well run and organised, but I have only performed here once so I cannot say whether or not it is so good each week.

TNT (Tuesday Nights at Torriano's) is a great gig in Kentish town run by the lovely Sarma. Always a decent and warm audience, very well run and they get in pro's to headline. I'd strongly suggest going to support and speak to Sarma at the end of the night to book a spot.