There's just one problem with that: as far as I am aware, none of ou councillors were elected with a mandate to oppose the improvement of educational provision in Marple.
Dave, I wish you'd stop using this simplistic argument. It's the equivalent of "if you're not with us then you're against us" or "if you're not part of the solution then you're part of the problem". I seem to remember GW Bush using it in the early days of his "War on Terror" and how that turned people off from valid points that the US might actually have made.
Just because the councillors oppose the development of Asda on Hibbert Lane does not necessarily mean they "oppose the improvement of educational provision in Marple". Of course they'd be in favour as it would be suicidal for their election chances to say anything otherwise. But they weren't elected on that single issue (and in fact only two of the current six councillors have been re-elected since the supermarket issue became public knowledge).
Some people take the view that Asda's arrival will damage local businesses (and I'm not really bought into that argument). If the councillors stood on the issue that they "fully support all measures to improve the provision of educaltion in Marple" the argument could be turned right around and they could be accused of having a mandate to oppose all development of local businesses.
You
know that the argument is much more shaded than one opposes or supports education and your black and white argument diminishes some of the excellent points you have made.