:I hope Bob doesn't mind if I offer a couple of thoughts here. First, your original edit mentioned two OFSTED reports. You can't - or at least shouldn't - make an editorial link between them as you seemed to do in your edit, but you can cite an OFSTED report as a source in a Wikipedia article. (A slightly different thing is citing the government stats database, which I did in Marlowe Academy which you may wish to take a look at as a comparative example). So you could cite both OFSTED reports (if you have them), one in one sentence, and one in the following sentence, but without editorialising about the apparent difference in any way. ("In year X, the school was rated Excellent by OFSTED. In year Y, the school was rated Poor by OFSTED." Or whatever it may be - and citing the source for each of course.) 

 :Second, if the situation at the school is all the talk of the Isle of Wight - as I'm sure you're right that it is - then it will have been mentioned in local newspapers by now. Obtain copies of those newspapers, and cite them. Them not being available on websites does not stop them being valid sources.