Well I opted for karrimor munro boots as the independent had them number 8 in 10 best boots and said they are very waterproof... that are full grain leather...went for a short walk in our local park and was very comfortable but can't say as to how waterproof they actually are as only went through some small puddles.
I'm sure they'll be just fine.
You're gonna want to wear them in properly since they're made of leather. You
might get away with going on a proper long walk up hills etc without it but you might not, and if you don't, it will be miserable. Wearing around the house helps a bit, but it's no substitute for doing some longish walks.