They run training courses for special needs pupils and teachers, but college is just as wrong. I really left it as a school to open the debate on what should be used but 'activity_centre' is probably better?

You are probably right. The edubase seems to be creating it's own rules for identifying establishments. *I* would expect each one to have it's own campus ID so an inspecter knows just which site they are inspecting, but there are NO details of the many secondary campuses on the list :( South Worcestershire has to sites and Heart of Worcestershire has 12 across four towns but edubase only lists one.
If I switch to the 'Warwickshire College Group' but keep the CURRENT name we get other errors thrown by the current checks which is what we need to establish guide lines for?

Full extent of the Abbey College still needs adding... website quotes 70 acres of grounds :)

c1995 ... names should be proper upper and lower case. They are used by the search system so should be as they appear on the building.

c1995 .. we prefer NOT to delete existing ways when making changes. There is a problem with accessing past history if that data is removed, and so we have lost the history on the Debenhams building now.

When I first saw the detail on the Combe Park site it looked reasonable, but actually it has some major holes in the building layout which may be easier to rectify by removing more of the existing unlinked elements and replacing them with more continuous outlines with the internal courtyards as multi-polygones. There is also a substantial section of single story buildings that still need to be included.

While there may be a case for some of these in central London, as far as I am concerned Hayes is a town in Hillingdon rather than a suburb of London. Since 'London' does not form part of the address, address wise this is a town and I would make the same case for other towns in this list.