WishIwasyounger Buy an electric blanket they are not expensive.
If you vou cannot afford to have heating on during the day. It can only be for one of two reasons. You cannot afford it because your income is so low, in which case you should check with Age UK whether you are getting all the benefits you are entitled to, or that your house is badly insulated, in which case, go round to Age UK and investigate all the help available to enable you to fully insulate your home for little or no cost.
Having said that. Our central heating comes on morning and evening and we do not have it on during the day because we feel no need for it, except in exceptionally cold conditions. We have a large old house but have insulated it as well as possible and it holds heat. We also prefer putting on another sweater to turning the heating up.