Claim: Some of the KT postcode areas are KT1 for Kingston Upon Thames and KT5 6 for Surbiton.
Evidence: The KT postcode area, also known as the Kingston upon Thames postcode area, is a group of 24 postcode districts in England, within 19 post towns. Postcode district KINGSTON UPON THAMES Kingston upon Thames, Hampton Wick, part of Norbiton Kingston upon Thames, Richmond upon Thames SURBITON Berrylands, part of Surbiton, part of Tolworth Kingston upon Thames