Russell Hobbs Old Style Kettle Needs Descaling (Bournemouth BH1)

A Russell Hobbs old style kettle that works although it doesn't always tun off automatically due to a significant amount of limescale inside. It basically needs descaling with some vinegar or another descaling solution. I've got another kettle so I don't need to sort this one out, but it would be a nice free kettle if you've got some descaler.