The village of Upwell in Norfolk is well worth stopping at and having a mooch round. Unless you have a decent map onboard you’re hard pressed to know whether you are in Norfolk, Cambridgeshire or Lincolnshire. Over the years it has had its local authority boundary changed several times. It is intersected by the River Nene, has a pub, a cafe and butchers – and more besides.
I was staying on a nearby and outstanding CAMC CL at the Bluebell Inn in Whaplode St Catherines which is definitely in Lincolnshire.