Hughes500,
UK based pilots (the accident pilot obviously isn't) are required to comply with the ANO's low flying regulations. Those regulations are in place to prevent pilots from doing things in or over congested areas that may result in accidents and cause injury or damage to folks on the ground.
If you are UK based and think the events depicted on the video comply with CAA low flying regs, for flight in/over congested areas, or were in accordance with "normal aviation procedure" I suggest you re-read them.
Operating from airfields (licensed or government) is a different matter and are allowed for within the regulations.
The accident clearly occurred outside of the terms "takeoff or landing" and "normal aviation practice". It appears to be the result of a botched attempt at a low fly by of the departure point.
A question for you: Have you ever applied for, successfully received and operated in accordance with a CAA Rule 5 permission to operate to/from a congested area?