Mole Valley (UK Parliament constituency) Horsley, Effingham, Lovelace, Send, and Tillingbourne. The constituency is larger than the Mole Valley district in Surrey as it includes five wards in the east of the Borough of Guildford, three of which are nearer to Woking than to Dorking. The largest town in the constituency is Dorking, second largest is Leatherhead and there are many rural and semi-rural villages, generally within one hour's reach of London so properly classed as part of the London Commuter Belt. The constituency was created in 1983; much of the same area was covered by the Dorking constituency which preceded it. It is a
River Mole the Pipp Brook, a tributary draining the northeastern slopes of Leith Hill. Between Dorking and Leatherhead the Mole cuts a steep-sided valley (the Mole Gap) though the North Downs, carving a river cliff on the western flank of Box Hill and a smaller cliff at Ham Bank in Norbury Park. The sudden change from impermeable Wealden Clay to permeable chalk and the increased gradient of the river (which drops in the stretch between Brockham and Leatherhead, compared to in between Horley and Brockham) allow the water table to drop below the bed of the river. Water is able to flow