Thanks for the thoughts (and no, Glasgow ain't much warmer than Greenock : )
I think we're caught between a rock and a hard place here. We didn't think this through (this is our first year so we're trying a bit of everything) and having both come from other places to Glasgow we didn't have much local knowledge when we ordered seeds etc.
We could take them up and down - the allotment is a ten minute walk away and the twice daily exercise isn't a problem because as two postgrad students we aren't constrained by a 9-5 in an office. However they'll need to come out of the propagator soon, but carrying a dozen pots up and down isn't going to be easy. I was wondering whether we could plant them out in the greenhouse containers and then cover them with cloches or insulation each night. Uncovering them each morning and covering them each night would allow much more sun and daytime heat than they'll ever get in the apartment, and perhaps with extra care they will survive the nights. It'll also involve less risk of damaging them moving them up and down each night.
The problem is we're hardy northern folk so the heat is off now at home and we don't have an airing cupboard or accessible fridge top to keep them snug on.
On a side note, I'm developing an ad-hoc 'trombe wall' for our shed. I'll put some pictures up this week. I was inspired by the fifth photograph in this blog, belonging to a downshifting couple in Nova Scotia, who visited a organic farm in their region.
http://floramary.wordpress.com/2009/03/25/organic-gardening-on-the-kitchen-table/The lady who runs the farm uses a big collection of old plastic milk bottles (filled with water) to absorb heat during the daytime and then release it at night. Aware of the problems we have with cool nights, I've started collecting (admittedly smaller) 1L and 2L milk bottles. I'm painting them matt black and arranging them along the edge of our south facing shed's window. Of all the colours, black absorbs the most and reflects the least amount of heat energy. I'm hoping that once we have enough these will absorb some warmth during the day time and then release it as they cool during the night, making a small contribution to the warmth of the shed.
Thanks again, we'll also consult our local friends and have a think.