Naked housework is great, but I don't think I'd do it if I had visitors.
Are there sauna complexes in the uk where you can hang out all day? Though I've never been to one on my own and don't know if I would.
Other options are campsites (though you might have to travel quite a way to find one at this time of year). Naturist campsites are great. A whole week of not having to get dressed!