Right, a couple of decent routes to try before you hang up your leathers(!), not necessarily all smooth but fun:
Route 1: Take A155 from Boston to Horncastle, continue up to Louth going past Cadwell Park (drop in & see if any track action on), take A631 to Market Rasen then A46 to Lincoln, A158 back to Horncastle then back to Boston
Route 2: From Boston take A52 to Osbournby, A15 to Bourne, A151 to Corby Glen, B1176 up to the A52 near Grantham. Drop into Chris Walker Kawasaki in Grantham for superb cafe, and see the H2R and some of his old race bikes on display, take A607 to Melton Mowbray then the B6047 towards Great Dalby, cross the A47 and continue towards Market Habrorough, pick up A47 to Corby then A43 to Stamford, Stamford to Bourne and back to Boston
The roads around Stamford and Bourne form part of the Performance Bikes test track and the B1176 and B6047 are often listed under 'great biking roads', it is a bit flat and featureless around Boston but it doesn't take long to get away from there and don't forget the best bike clothing and accessory store in the land, Sportsbikeshop, is based in Boston too :smile-new: