Isn't it more likely to be the university influence that made the difference? I notice that in South Cambridgeshire the Labour vote increased by 7.4% and a lot of people associated with Cambridge University live there.
Not a good example, because a) South Cambridgeshire wasn't a target seat and hence must have seen much less campaigning activity than Chester; b) the rise in South Cambridgeshire merely partially reversed a Lib Dem tactical squeeze in 2010 and c) South Cambridgeshire isn't that university-dominated - and the wards with most university influence are some of the most Conservative-friendly.
b) the rise in South Cambridgeshire merely partially reversed a Lib Dem tactical squeeze in 2010
Useful point to mention that it should certainly not be assumed that the people who switched to Labour in absolute no-hoper constituencies where Labour had previously been tactically 'eliminated' are demographically 'typical' of those constituencies...
“Actually, I think ‘A Bend in the River’ is much, much better than Conrad,” Mr. Naipaul said.