Box 1 pair are still roosting every night, but are showing no signs of building a nest. They actually removed the nest that was in there from the previous year and were just roosting on bare wood. So yesterday Steve collected some feathers and put them in the box whilst they were out during the day, just to give them a hint. This morning there is an egg in the box.
No proper nest though and I don’t think they intend to breed this year so the egg will probably just roll around for a few days or get ejected. Hopefully they’ll return next year and do it properly! Box 3 are both still incubating.