I am confident that the BD/MK tour will play London and, in my view, more than one show. They're both big there. I can't imagine a European tour by Dylan without a show or shows in London. It's unthinkable!
Anyway, on past form, it's not just the fans in London who will go. Dylan fans will travel from all over the place to catch him in London. MK fans, too, I guess. I've certainly met MK fans from Europe and North America at his London shows and, for Dylan, from those continents and from as far afield as Australia, too.
At present, I'm down for the Bournemouth show but, if Dylan does two or three shows in London, I shall definitely be after tickets for all those (assuming it's not a vast place like the O2). At the end of a European tour, especially if there are multiple dates, we're likely to get a lot of song variation from night to night. Perhaps Mark will follow suit.
And, if they haven't played on stage together earlier in the tour, odds on they'll do so in London - unless they have a clash of egos along the way, of course.
I'd even like to think that Dylan might try out Mark's studio whilst he's here. There may not be time because Dylan appears to prefer to get back home for their Thanksgiving.