B351 from the railway line
The B351 consists of two roads either side of Richmond Park.
It starts on the A3003 in Mortlake, close to the bank of the River Thames, and heads south, crossing a railway line by a level crossing adjacent to Mortlake station, before reaching the A205 which it crosses at a set of traffic lights. This marks the original northern end of the B351; that which has gone before used to be the A3003.
Continuing south through East Sheen, the B351 reaches Richmond Park which it enters at the Sheen Gate. None of the roads across Richmond Park are classified, so the B351 disappears at this point.
The B351 reappears at the southern edge of Richmond Park at the Kingston Gate. It heads south along Queen's Road to end on the A308 Kingston Hill.