Delilah

Hi there, I wonder if anyone can advise me, please? Our bathroom is always cold! it is on the ground floor of our house and two of its walls are external. We refurbished the bathroom (and had our cavity walls insulated) when we moved in a few years ago. (there are no holes or gaps or cracks). Our heating system is a combi boiler and the bathroom has a radiator rather than a towel rail as they give out more heat. Is there an additional heating alternative that we could put in, please? (My husband says it is not possible, but he is well renowned for saying things like that when he does not k