start. at last drain cover in layby on top of hill on a303(t), andover bypass eastbound carriageway (gr374444). proceed east on a303(t) through barton stacy and bullington cross to start of m3 motorway. bear left onto slip road (m) turn right under motorway (m) (12.35m),and follow road to rejoin a303(t) in a westerly direction. retrace to andover bypass and continue to slip road onto a3093(m). take slip road, pass under a303(t) and continue to rbt(m) and take first exit to finish on a3093 at lp 52 just before footbridge over road.