Hot water bottles are a great way to heat yourself up as the temperatures drop and can sometimes be so effective they prevent you from putting your heating on. But did you know that the hot water bottle you're using at the moment may not be "safe"? But there's a way to check whether you can carry on using it, according to Which?. The consumer experts took to TikTok to explain the way to "check if your hot water bottle is still safe to use" - and it's by checking a little-known symbol you may