https://techcrunch.com/2018/07/30/psa-drone-flight-restrictions-are-in-force-in-the-uk-from-today/

Consumers using drones in the UK have new safety restrictions they must obey from today, with a change to the law prohibiting drones from being flown above 400ft or within 1km of an airport boundary.

Anyone caught flouting the new restrictions could be charged with recklessly or negligently acting in a manner likely to endanger an aircraft or a person in an aircraft — which carries a penalty of up to five years in prison or an unlimited fine, or both.