Well I hope the cleaner is due then Jeni! Maybe a nest of wild bees has been attacked by parasite bees or something? I had a bumble bee nest in a bird box last year and the colony disappeared suddenly. My forensic examination revealed that they had been obliterated by a wax moth, which made the most amazing tough silk mat thing, in which to rear its own brood.
Keep us posted gally ...
Oh *glass" I do sympathise - had one for weeks after easter, not like me. Frustrating ailment. But if viral, you just have to wait for it to go. (downward turn can indicate chest infection - in my case it indicated a second blooming virus...)
i have my GC coming tomorrow
- for a long weekend before they fly out. 
So i have a bit of work to finish, more food shopping to do and a long list of odd tasks that, if not done today, will be on hold until Tuesday. Glad they are not flying in next week, what with the threatened strike and all. At least in the Uk you don't go through immigration on the way out.