Wedding photoshoot - insurance? UK

Hi All,

I have been asked to be the photographer at my friends wedding. While I've been dabbling in photography as a hobby, this is a first time genuine job. I am not registered as a business.

The question is - do I need liability insurance and are there any things I need to be looking at? I want to provide her a relatively cheaper price because she's a friend but I also want to make sure I'm doing everything correct.

Any guidance in the right direction?