As this happened before, just a few months ago, I knew exactly where to look. Jobs are always easier the second time.
This meant I couldn't make the journey to work, so I split the day between working from home, and car maintenance.
A quick post to the scoobyireland.com forum told me I could pick up a brand new one in Magherafelt, so I set off before lunchtime. Of course this journey was made much more difficult by last nights snow - although there was only a few centimetres it was freezing hard, and it lay, making even main roads treacherous.
I picked up the pump, and later on got it fitted. It is quite a relief when you turn the key and the engine starts.
Later on this evening I tidied everything up, screwed the seats back in etc, and that's the job done. Wonder what the next component to fail will be.....