LSE havn't been left wing extremists for years, hell Tony Blair's entire new labour concept eminated out of people linked to LSE and if you search their forums LSE is full of wannabe investment bankers, laywers and economists.
Perhaps its true of other universities too (likely), but political views are certainly a contentious issue where i'm at - everyone knows who the resident marxists and thatcherites are, so this could well be true.
Manchester's union is full of rampant, slavering Lefties. One look at the candidates in the student newspaper i picked up, and all of the stuff they post on their website is really left-leaning.