If Harry couldn't remember the friend's address, you would think one of his 40 personal security would remember. I think it's funny that the Ring captured Harry, but not any of the bodyguards (you know hired for he and Meghan's safety, especially in the UK) were captured either beside him or right behind him.
What an idiot, I'm sure Harry was either drunk or stoned...or too dumb to remember a friend's address. It should have been simple since this is probably the only friend left in the UK to be a friend of Harry's.
As for SoHo House, there was a story out before Easter that speculation is that Markus Anderson and Meghan's friendship has rapidly cooled off. We shall see.