UCAS application --- help needed entering work experience

Hello people,

I have two things I need help with.

I’ve done some veterinary work experience (non-paid) related to my course choice which is a requirement also. How do I put this on my UCAS application? I’ll obviously talk about it in my personal statement but I fear as though I’ll be asked for proof. Do I just mention how long I’ve done my work experience in my personal statement or will they ask for references? (Something I don’t have from my first placement)
And if so, where in the UCAS system do I put it in?

ALSO

I volunteer at a few places during the week, this is obviously not paid but is it something I just mention in my personal statement only and nowhere else on my UCAS?

Hope I’ve made sense!

Thank you loads!