Hey DV - sounds like a good run nonetheless...
I've just read a bit about National Trails etc - if I get on Peddars Way at the North Norfolk coast (nearest trail to me) apparently I could get all the way to Lyme Regis on the Dorset Coast!! Peddars Way links to the Icknield Way, which links to, then criss-crosses, the Ridgeway, which then links to the Wessex Ridgeway, down to the coast....
Now that would be a challenge - perhaps for my 50th...