The most useful thing to do with the tables can be to put them side by side : then you really do spot the decent unis on the slide , or ones that may be excellent but clearly aren't that good for a subject. Edinburgh is strikingly low for English on both tables for example : so that might mean a very bright student for whom Edinburgh has allure might look at a different but equally good uni which is by all accounts better for English. Hull is the other uni which, whilst not in Edinburgh league, was always popular. It has been interesting to note its slide down all league tables over the last 10 years. It does seem to be reviving a bit.
Soem subjects are so conflated as well. it is impossible to trust either league table for something like film or journalism or media since they bung them together in odd combinations!
Uni of Suffolk has done well for history for years on The Guardian league tables. It is an oddity. If choosing a lower tariff uni for history, I'd be targeting Winchester with its rich local history , and where Alwyn Turner lectures.
My local uni has managed a spectacular bottom place again...