In reply to TobyA:
I guess the Cambridge thing is because
a) it's a Monday rather than a weekend
b) it's one fairly standard flat stage rather than two interesting bumpy ones including stage 1
and consequently non-local people are more likely to head up to Yorkshire for the weekend than over to Cambridge for the day. If stage three was something like Bedford to London rather than Cambridge to London I probably wouldn't bother taking the day off to go over there to watch it.
It'll probably be fun on the day, though.