Yeah I already have a run in my garden which we bought for my bunny :-) but my bunny runs the whole garden lol someone is always out there with her by the way!:-)I agree with piggyfan, keep them indoors. It is better for you & the piggies. You can always get a collapsable run to give them time on the grass when we have the occasional dry day. (ha ha).
Is it 2 pigs you are getting? If so I think the minimum is a 120cm cage and the Ferplast 120 is apparently the best. However, the more space you can give them the better, and some of us on here have C & C cages which are made from shelving grids. Have a look at the cages in our housing section and you will get plenty of ideas.
inside is best x