I've never heard of the London venue, is it new or just some place with a new name? Moving from Birmingham to Wolverhampton seems odd, surely Birmingham has other alternate venues?
Manchester is fine but I doubt any promoter would reschedule a venue with a smaller capacity than the number of tickets they've already proving they can sell.
Promoting legacy acts in the UK seems a lottery, for every Rush tour that prints money you have acts like Journey and Sammy that far less people care about than you would like to think.

we fall to rise