In reply to Jan van Schaik:
Googling "virgin active fitness clubs in london with climbing" returns a result with a link to a pdf with all Virgin sites and activities. It shows that, as of 2016, 200 Aldergate and Twickenham had climbing walls.
I would have included the link but it just opens the pdf.
Edit - Video here; shows the wall (sort of) at 52 seconds for 200 Aldergate. Yes, I'm bored this morning!
Edit 2 - Video here for Virgin Twickenham wall.
Regards,
TJB.
Post edited at 09:10