http://www.legislation.gov.uk/uksi/1981/14/madeThe Town and Country Planning (Tree Preservation Order) (Amendment) Regulations 1981enKing's Printer of Acts of Parliament1981-01-19 The Town and Country Planning (Tree Preservation Order) (Amendment) Regulations 1981RegulationsThe Town and Country Planning (Trees) Regulations 1999reg. 18(1)reg. 18(2)reg. 1(2)