:-)
Chapter and verse:
formatting link
Selected highlights:
Approval for supply, storage and use of amateur creosote/coal tar creosote products expires on the 30th June 2003. ... This means that ... from 30th June 2003 the general public will no longer be able to use wood preservatives that contain creosote/coal tar creosote. ... If members of the public have creosote after the 30 June 2003 they should contact their local council for advice on disposal. ... Approvals for Professional and Industrial creosote/coal tar creosote products have been allowed to continue, subject to restrictions on the specification of the products.
Presumably, the recommended way of disposal is to paint it on a fence!