From the ANO Schedule 8 Licence privileges:
(4) Subject to paragraph (5), he shall be entitled to fly as pilot in command of an aeroplane of a type or class specified in an instructor’s rating included in the licence on a flight for the purpose of aerial work which consists of:
(a) the giving of instruction in flying; or
(b) the conducting of flying tests for the purposes of this Order;
in either case in an aeroplane owned, or operated under arrangements entered into, by a flying club of which the person giving the instruction or conducting the test and the person receiving the instruction or undergoing the test are both members.
And Article 126
Aerodromes - public transport of passengers and instruction in flying
126 (1) An aircraft to which this paragraph applies shall not take off or land at a place in the United Kingdom other than:
(a) an aerodrome licensed under this Order for the take-off and landing of such aircraft; or
(b) a Government aerodrome notified as available for the take-off and landing of such aircraft, or in respect of which the person in charge of the aerodrome has given his permission for the particular aircraft to take off or land as the case may be; and in accordance with any conditions subject to which the aerodrome may have been licensed or notified, or subject to which such permission may have been given.