Anyone thinking of using some or part of the Asparagus and Strawberry route who uses a GPS - dont forget that Maladict , GPS defined, the route ( although he was a DNS ) and I can confirm that it worked well - including no probs at all with the Balsham turn. I am sure he would share it again.
I also can offer my Norfolk Pootle route , a 200, - which visits several Norfolk market towns - this or part could be used as a building block to make a 400.