http://www.legislation.gov.uk/id/uksi/2015/596

SCHEDULE 2Permitted development rights

PART 5Caravan sites and recreational campsites

Class C – use of land by members of certain recreational organisations

Permitted development

C.

The use of land by members of a recreational organisation for the purposes of recreation or instruction, and the erection or placing of tents on the land for the purposes of the use.