has urged people to check whether their hot water bottles could be out-of-date, which could potentially pose a danger. There is a hidden symbol on most hot water bottles which indicates their ...

"To verify, you can check your bottle's date of manufacture - just look out for this handy daisy wheel symbol," he advised ... injury but noting the potential danger. Which?' ...

But it's important to have safety in mind when it comes to hot water bottles. Many hot water fans were unaware that there's a hidden symbol on the bottle which tells you if it's still safe to use.