We drink it, wash with it, (sometimes) curse it when it falls from the sky – and we also pay for it. Water is fundamental. But how much do we really know about how it all works?

Martin talks to the Chief Executive of Scottish Water, Alex Plant, about rising bills, climate change, and why we need to start thinking seriously about how much water we use.

Get in touch with the Scotcast team by emailing scotcast@bbc.co.uk