We swapped houses through the NCT register last year. The couple used our guest bedroom which hadn't been used very often as my husband uses the room as an office. We'd had a new bathroom put in and the room had been re-done as it used to be a bathroom but unfortunately when the builder had finished his work 6 months previously he didn't check that the soil pipe was clear.
This is when things get a bit revolting, anyway after a couple of days the pipe filled to the top and literally burst back into the bathroom filling the bath and loo with sh*te. A plumber came round and took the cover off the vertical pipe outside and literally got a face full! How embarrassing and we never heard from the couple again, funny that.
Anyway this year we've joined an international agency and made a tentative exchange with a family in California, they have a couple of acres and 6500 square foot of house, can't wait. R.