I've done 2 summer schools at Oxford and know of many who return year after year, which is a good sign. They do two types - one known as The Oxford Experience, and is held at Christ Church College, the other is held at Rewley house. The difference is that while it includes lectures on whatever subject you've chosen, the former is very much a social affair, that doesn't contribute to an Oxford qualification. The latter, is more demanding - a fair bit of studying and essay writing - but you earn CATS points towards a degree. Rewley House, Oxford, is pretty central and has it's own library, bar, restaurant, accommodation etc, however you can opt out of the accommodation and stay at a normal Oxford College. For my first Summer School I stayed at Magdalen and Keble, For my second it was Christ Church. Both summer schools offer a huge range of subjects, but you need to book early as they fill up, particularly the Oxford Experience. The age range for both is everything from 18 to 80. I will definitely do another. I haven't done a summer school at Cambridge, but suspect they are good for science, though not in the running with Oxford for other subjects. I did do a more normal degree course at ICE (Cambridge Institute of Continuing Education) and was not impressed. Oxford tend to be a bit more expensive, but worth it, unless you're into science, in which case you might be stuck with Cambridge. However for politics - which seems to be you're area if interest - I'd definitely go for Oxford. Hope this is useful.