Nuts and rolls will be fine for your pigs - our KK piglets start eating them from as early as a week old in some cases, and all are on them by 4 weeks of age

East Coast viners (unless you're close enough to go and collect) will only deliver in tonne pallets and the feed lasts approx. 3 months before going 'out of date'........will you use 40 bags in 3 months ?
Most agri-suppliers will carry pig food - Farmgate, Dodson & Horrell, Carrs Billington (to name but a few brands) and all are much of a muchness really. Check price -v- bag size as some can be more expensive

HTH