Tried the Pimlico site which was chilled and not rushed, nice atmosphere, en suite bathroom - would go back
The Victoria site however was like Picadilly Circus at the worst of times with delays, 1h paid turning into 45 min actual time, prep time for the next guy on your own time, knocks on doors, people hiding behind doors, use of shared bathroom restricted to 2 min...etc giving an impression of very little respect for the customer - would not go back there
West Ken - to be tried based on comment in above post