There is no law to prevent it!
You're kidding, right? It is absolutely illegal to operate an aircraft without the necessary qualifications (licenses and ratings), unless you are a student performing a training flight with a certified instructor. Your being the "pilot in command" does not give you the authority to break the law (emergency situations notwithstanding).
If you mean "it's illegal but also unenforceable" (no CCTV in the sky yet, not even in the UK
) then you might have a point.