A substantial new bypass opened recently around the village of Longstanton north of Cambridge. A friend on a bike ride collected the track yesterday so I was able to take his track and description and add it to the map. As far as we know, it's not on any other online map so far.
(By the way, the big chunk of green on the Google side labelled bizarrely 'Cambridge' is a golf course, which we have on the map at the club house, but not the area; the roads south of that are private: part of an barracks, a "prohibited area under the meaning of the official secrets act", which is now a detention centre for refugees with armed guards on the gate, so I chose not to try to map it when I first surveyed Longstanton! Google is perhaps misleading in even showing these - they look like residential streets, but are inaccessible.).
Interestingly, Google doesn't even have the "old" bypass (the rather obvious gap between two roundabouts) that preceded the new one further out, and which has been there for several years now
This bypass severs NCN11 - there are now earth bunds and locked gates along the line of the old road, which was a quite senseless decision. NCN11 is now routed along the main street of the village and along the new high-speed by-pass. Crazy. However, this may only be short term, as the whole of NCN11 will be rerouted to use the entirely off road cycleway alongside the Cambridgeshire Guided Bus between north Cambridge and St Ives at the end of this year (it's delayed).