You've possibly tried this, but have you used the ukp search function?
Put in Canary Wharf, London region, increase the number of hits to 200. Choose sort by most relevant or newest (different results).
It would cover all the reviews for anyone who works from Canary Wharf, but also anywhere where Canary Wharf has been mentioned in another thread/post, which might help you.
You would then have to trawl through all of those hits, but a name might jump out at you.
