John MacLeod wrote in news: snipped-for-privacy@l6g2000yqb.googlegroups.com:
Thanks for the input. As it happens, I actually have an infra-red spotlamp bulb. I was always afraid to use it, as it was (I think) 200W, which I thought would cause my light fittings and wiring to overheat. I think my father bought it in the 1980's hoping it would relieve his lumbago. But yes, they are certainly a way of getting some instant heat from above.
Al