Many of us would crawl through fire to avoid LHR
Many of might crawl through fire to avoid inconvenient schedules.
I lived in Cambridge's (western) catchment area for a few years and my car literally knew it's own way for the less than one hour journey along the A14 & M6 to BHX for, throughout the day, a much better variety of services than Cambridge will ever offer.
Stop thinking that London is the only reasonable alternative to Cambridge ... It isn't!