Bear in mind if you are planning to have them outside the hutch needs to be fox proof, and any runs you invest in should have the tops covered. In the winter ideally they need protection from the cold, a shed or garage (not where cars are stored) is ideal.
A good book to buy is Guinea pig lopedia, about £8 from Amazon. It lists many useful things including how much and what types of veg, what wild feeds you can go foraging for and many basic illnesses and what to do. I'm currently training to be a rodentologist, I just need to sit my exam but I never seem to find the time!
Vet recommendations, Peak Vets all the way. They operated on some of my piggies and for various reasons, ans they havent lost a single one. One of the partners (I think it was Greg?) has recently done extra training on specifically small animal medicine. They are in S8 on Olivet Road, they have a facebook page which is regularly updated too.