Finally Peter has replaced all the old filament light bulbs in our house with eco ones. The first attempt at a photo shoot ending up with Peter falling off the ladder and taking a lot of skin off, but now fully mended was reluctantly allowed to venture up the ladder again.
Hopefully these bulbs will last a lot longer than the old ones as we always seemed to be replacing them. So, perhaps cost-wise, having to replace the old ones quite often, and the eco ones not very often, it would probably cost the same price in the long run.
This gives us an 80% power saving on lighting.