The dates listed by Mike also appear in the Sunday Express paper ad, however the Mail on Sunday advert has others.. Norwich Theatre Royal 25 July, Stoke Victoria Hall 26 July, Leeds Grand Theatre 27 July, Blackpool Opera House 31 July.
Now that's weird because I got my info from The Mail on Sunday as well!!!
The edition I have definitely only lists the dates I posted, although I'm sure gerald_mouse is correct in what he says.
One thing I forgot to include in my original post though - these extra dates are listed in my paper as being SUMMER FESTIVAL 'GREATEST HITS' SHOWS. The implication being that the band will NOT be performing 'The Wall' at these additional venues, presumably because the stages are too small?