Hi,
I have moved out to West Sussex, but love using Dean St Studios (formerly Tony Visconti's Good Earth) if we are working in town. Great people, Wonderful room, SSL AWG, Protools, and more neve pre's than is really necessary. Wunder u47, u87/Innertube mod, and right in the middle of Soho. Tell 'Em I sent you! I am there next weekend, and again after xmas.
http://www.deanst.com/
or 0207 734 8009
Studio Manager is Jasmine Lee. She rocks.
Or try Miloko, which seems to run nearly all the other rooms in London/Europe! They have loads of rooms, all with Protools. All types, and specs.
http://www.miloco.co.uk/
0207 232 0008
I am certain Strongroom is really cool too, but I haven't had the pleasure so I can't give a personal recommendation. My friend works there, and loves the place.
KIndest regards,
ANdyP