I've just got light, fairly transparent curtains in most rooms, so they don't do much for keeping out the cold. They're there because the look nice <shallow> but I regret that now as they're so impractical.
Does anyone know anywhere that I could buy warm curtains for not too much money please? Or is there a way I can rig some myself?
You can buy bonded lining, which is interlining and lining (bonded together, hence the name). Dunelm Mill sell it, although it is cheaper at our local fabric shop. This really works - it is likely having blankets sewn into your curtains, and as well as keeping the heat in, it also makes curtains drape much better. If you are handy with a sewing machine, you can sew it into your curtains, or alternatively hem them all around, put curtain tape on the top, and use them as detachable linings.