Calum,
Thanks for the offer. I could exchange that advice for some accomodation in the Forest of Dean if you are in the area, to save you some money.
In my situation, I tend to keep it running 24 hours at a fairly low level, especially here in a valley where we've been known to suffer frost in July, because I've always considered it a false ecomomy to turn off and on, especially in the fairly typical local stone buildings which tend to act like storage radiatiors, it takes a long time to build up but once the whole building is warm, it's easy to keep it topped up.
If I need rapid radiant heat, the logburner can provide it, and the thermal bank can be topped up overinght on cheap rate electricity. I guess solar panels won't do much in the winter and produce more than I need in the hight of summer, but in spring and autumn I'll be getting reasonable returns. Navitron, who supplied for a recent TV series on "being green" are about 12 miles from here.
Actually, one thing you (or others) may be able to answer now, is on the subject of additive.for bonded thin screed. I've been reading about Fibrin being able to reduce risk of shrinkage and cracking. Would you use it?
Jeff