What do you think of a 16/20 age gap in the UK?

Personally if i was the guy it would be hard for me to get with a girl who is 16 no matter how mature she is, with that said, it doesn't mean the relationship can't work, because it can. As far as legal issues are concerned, nothing is wrong as the age consent is 16. It's all up to you whether you want to jump in the relationship, it's only going to work if you're mature. You seem like a good time though, peace have fun.