start in bus lay-by on a251 approximately 50 metres from challock rab (halfway house ph). take the first exit to join a252, proceed to charing rab (4.12 miles). take care on fast approach to roundabout. take 4th exit to rejoin a252 to climb charing hill to challock rab (8.2 miles). take 3rd exit onto a251 to boughton lees where left to kemps corner (11.93 miles). left to join a28 to chilham fork (17.25 miles). left onto a252 up molash hill to finish at challock rab road sign approximately 80 metres short of challock rab (21.9 miles).