....I seem to have completely lost it!
Having 'retired' from visiting a few regular SPs on AW since becoming a taken man, I still have an itch that needs scratching.
Perfect solution, to me, is the fbsm option - *almost* guilt free.
Trouble is, as soon as I get within line of sight of the massage shop I completely lose my bottle and stroll past!
I know, I know, London's a busy place, noone cares etc
I don't want to spend my life trapsing around London looking for discreet parlours!
Any tips to get me up and running?
That's a change of heart. You were looking for cum queens only a month ago. Still, do tell us how the conversation with your Mrs goes when you try to explain to her that FBSM isn't cheating

. Walking around Soho you often see blokes hesitating outside walkups or keeping their heads down as they scurry past. Makes me smile.
I do remember the anxiety though from my early days punting, particularly when you're standing like a muppet at the door and they won't let you in. The only thing I can recommend (besides manning the fuck up) is to try some breathing exercises and positive mental thinking before you get there (look at the stuff posted online about preparing for job interviews or important presentations). For example, I stand with hands on hips, stick chest out, eyes closed, deep breathe and visualise success - in this case just strolling up to a parlour and walking through the door. Oxygenating the body and feeling confident will really help.
Alternatively, you find a few places a little out of the way, e.g. Maya massage in Hammersmith is down a quiet side street.
Best of luck, and don't forget to review.
Ps: don't even think about all the CCTV around the place..