Sorry mate, only bad news from me but I'm familiar with the grey door of Gloucester Place!
I used to frequent the same place too, run by the sexy redhead Rosa and Jon her husband. Must've seen around a dozen girls altogether over the year or so I went there. There was 1 girl I saw maybe 4 or 5 times there, blonde Brazilian girl called Evelina who had some sexy freckles, puffy nipples and fucked like her life depended on it. I thought the routine of tantric massage before full service was great and nice touches with the fluffy towels, bottles of water and calming music played everywhere.
What set these girls apart is that they were all trained by Rosa to give a top service and she always used to ask how they were after, wanting to get some feedback. The light blowing in the ear with the CC swipes was a turn on for me. I almost got Rosa upstairs once after I couldn't decide on a girl from line-up, but Jon wasn't having any of it
In hindsight, £160 for the hour was a lot for a blind punt, but after the initial good experiences I had, I kept going back. The rotation of girls and the fact that more and more were coming fresh off the boat meant I never really had a bad experience, some perhaps forgettable but never bad. The discreetness was good, moving from room to room and I only ever caught one sight of a Bruce Forsyth looking fella. Not you is it
I envy you as I wish I went to a party there! Please do tell, as I remember almost every room in that place and could probably visualise the whole thing. Especially the top floor with the stupidly steep staircase. I once caught one of the girls on it as her heel broke, thankfully she was petite. I think her name was Meite or something like that, small Spanish thing. Anyway, she loved my chivalrous act, we skipped the massage and she rode me so well she made me cum in a matter of minutes which was almost impossible for me. We then fucked in the bath-cum-shower on that top floor for most of the hour. I've got some great memories of that place!
Like you, I'd love to know if they've set up shop somewhere else but unfortunately I have no idea. Let's hope someone comes along with some good news.