It's cheaper for a reason. A desolate place. Sorry (not sorry) @danstuff.
My experience is from a fair few years ago, but south and east of Cambridge towards Newmarket was significantly cheaper than central Cambridge then. Easy-ish access to Addenbrookes and Fulbourn too.
It would be a boon to be working north of Cambridge as property is much cheaper that way. See for example this mansion in murderlicious Soham: http://www.rightmove.co.uk/property-for-sale/property-52180711.html