Air Navigation Order, Schedule 8, section 1, sub-section 1:
Private Pilots Licence...
(2) He shall not:
(a) fly such an aeroplane for the purpose of public transport or aerial work save as hereinafter provided:
(i) he may fly such an aeroplane for the purpose of aerial work which consists
of:
(aa) the giving of instruction in flying, if his licence includes a flying
instructor’s rating, class rating instructor rating, flight instructor ratingor an assistant flying instructor’s rating; or
(bb) 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;
So, a PPL can do aerial work, if it is flight instruction with fellow club members, and he has a relevant rating.
ANO, Part 14:
Public transport and aerial work - general rules
157 (1) Subject to the provisions of this article and articles 158 to 163, aerial work means any purpose (other than public transport) for which an aircraft is flown if valuable consideration is given or promised in respect of the flight or the purpose of the flight.
So, the above flight can be paid for by the student, and the club can charge normal rates.
Back to Schedule 8, section 1, sub-section 1:
[He shall not] (b) receive any remuneration for his services as a pilot on a flight save that if his licence includes a flying instructor’s rating, a flight instructor rating or an assistant flying instructor’s rating by virtue of which he is entitled to give instruction in flying microlight aeroplanes or self-launching motor gliders he may receive remuneration for the giving of such instruction or the conducting of such flying tests as are specified in sub-paragraph (a)(i) in a microlight aircraft or a selflaunching motor glider;
So as a PPL(A), he can't be paid for the work he has done.