Due to a couple of recent incidents (a tragic murder and a hnh session going wrong) there is an ongoing bit of law enforcement / revenue and customs (agencies fiddling the books) heat in the London W2 area. The online so called banks (they are not banks per se but clearing houses) monzo, revolut etc are refusing transfers and playing good cop- sucking the taxmans d@@k. The old William company are also engaged in knocking and checking private apartments etc. So keep your wits about you and use your six sense. 

I was about to visit London next week. It's good to know it, thanks for the heads up.