Our operations are conducted iaw our CAA approved Operations Manual and iaw CAP 393 Air Navigation Order, to summarize: The flight must not be carried out unless the pilot is satisfied it can be done safely.
The aircraft must be kept within the visual line of sight (500 m horizontally and 400 ft vertically) of the pilot. Operations beyond these distances must be approved by the CAA (the basic premise being for the operator to prove that he/she can do this safely).
Small unmanned aircraft that are being used for surveillance purposes are subject to tighter restrictions with regard to the minimum distances that we can fly near people or properties that are not under our control. If we are required to fly within these minima we will seek approval from any and all concerned parties prior to conducting operations.
We risk assess every sortie and pay due regard to airspace classification, airfield proximity and risk to manned aviation. Where any risk is deemed prevalent, we notify, or request approval from, local air traffic services and/or raise NOTAM’s in respect to drone operation to be carried out.