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There are many rules and regulations a commercial operator of a UAV has to abide by to remain safe and inside the law. However, here are two paragraphs, 166 and 167 from the CAA's CAP 393 Air Navigation Order that are  the most pertinent.

Small unmanned aircraft
166

(1) A person must not cause or permit any article or animal (whether or not attached to a
parachute) to be dropped from a small unmanned aircraft so as to endanger persons or
property.
(2) The person in charge of a small unmanned aircraft may only fly the aircraft if reasonably
satisfied that the flight can safely be made.
(3) The person in charge of a small unmanned aircraft must maintain direct, unaided visual
contact with the aircraft sufficient to monitor its flight path in relation to other aircraft,
persons, vehicles, vessels and structures for the purpose of avoiding collisions.
(4) The person in charge of a small unmanned aircraft which has a mass of more than 7kg
excluding its fuel but including any articles or equipment installed in or attached to the
aircraft at the commencement of its flight, must not fly the aircraft:
(a) in Class A, C, D or E airspace unless the permission of the appropriate air traffic
control unit has been obtained;
(b) within an aerodrome traffic zone during the notified hours of watch of the air traffic
control unit (if any) at that aerodrome unless the permission of any such air traffic
control unit has been obtained; or
(c) at a height of more than 400 feet above the surface unless it is flying in airspace
described in sub-paragraph
(a) or (b) and in accordance with the requirements forthat airspace.
(5) The person in charge of a small unmanned aircraft must not fly the aircraft for the
purposes of aerial work except in accordance with a permission granted by the CAA.

Small unmanned surveillance aircraft
167

(1) The person in charge of a small unmanned surveillance aircraft must not fly the aircraft
in any of the circumstances described in paragraph (2) except in accordance with a
permission issued by the CAA.
(2) The circumstances referred to in paragraph (1) are:
(a) over or within 150 metres of any congested area; (changed since Nov 2014)
(b) over or within 150 metres of an organised open-air assembly of more than 1,000
persons;
(c) over or within 50 metres of any vessel, vehicle or structure which is not under the control
of the person in charge of the aircraft; or
(d) subject to paragraphs (3) and (4), within 50 metres of any person.
(3) Subject to paragraph (4), during take-off or landing, a small unmanned surveillance
aircraft must not be flown within 30 metres of any person, vessel, vehicle or structure
(4) Paragraphs (2)(d) and (3) do not apply to the person in charge of the small unmanned
surveillance aircraft or a person under the control of the person in charge of the aircraft.
(5) In this article ‘a small unmanned surveillance aircraft’ means a small unmanned aircraft
which is equipped to undertake any form of surveillance or data acquisition.