cheers for that, dave.
i feel I ought to add that I was planning on building a run for them but at the moment we are having loads of work done at home (new land drains, new patio & paths etc.) so the garden is going to be re-levelled which means muddy mess for a while while it either grows through or gets re-seeded so I was hoping to leave them run-less for now and rely on lead exercise (or burrows) until the spring.
hopefully, as time goes on (if my little one, currently 3 gets an interest) I may have the excuse to build a bigger enclosure, i'm loving some of the ferret court idea