I share Al's disdain for over-emphasising the very crude measurement which is raw numbers of seats. But as far as the Tories are concerned, if you go around spinning that you are worried about losing 800 seats and then lose 1300, you have either had a very bad result or are hopeless at expectation management.
Are there more bad Labour councils around than there ought to be? Bolton, Sunderland, Derby (not Labour any more but still suffering the after-effects), probably now Barnsley...
Hartlepool as well.
Surprised you didn't mention Sheffield tbh - the trees, THE TREES!!