So, you want to fly drones? 

Insurance.

Even as a hobby flyer, you should get yourself insured. If you fly into something, or someone, you could very easily find yourself getting sued for the damage you caused. Insurance is cheap enough for most drones, and easy to get.

Be aware though, recreational insurance doesn’t cover you to any form of paid work. You need commercial insurance for that (you also need minimum certification of "A2 Certificate of Competence"). Again, commercial insurance is not that expensive to get, and you can get "pay as you fly" from some companies.

You can get insurance below. Coverdrone is one of the most recommended sites in the UK.

And the last thing you MUST do, is stay safe, stay legal, and enjoy flying.