Steady on Postie - with a good sense of humour like that we'll be asking you to be a Mod* if you're not careful.
*GSOH essential (along with a hide like a Rhino).
On the Turbo front: I've just got one and have had a couple of sessions on it whilst Cumbria (or at least the SW bit) experiences an extremely wet August - it is hissing down as I type. Turbo-in is not the most exciting experience on the planet but is better that doing nothing.
Re doing it in your greenhouse. That must be hot in there, hope you are hydrating well. A long while ago we had a greenhouse (detached conservatory we called it cos we are v.posh

) and we decided to have a very late and very drunken barbeque in our glass paned edifice. It was about 11pm, we'd had far too much to drink and lit up the barbie which was one of those small metal ones with proper charcoal and not one of those gas powered excuses for a barbie. We carried on drinking, had our fodder and then dozed off on our comfy sun-loungers that we were sitting on. About 3pm Lovely Wife woke up with a pounding headache, she then woke me up and I felt awful. Clearly we were undergoing some severe oxygen deprivation.

Lesson learn't! Keep the place well ventilated!