I've had a quick look and the water pump seems fine, the thermostat looks shot though.
Do you think I should change them both, or just the thermostat?
I can't quite see the point, the water pump is €500 + vat
that's a very expensive add on.
Are you sure it is worth it?
This is the prudent choice and worth doing while you are in there and will likely prevent a future overheat (ie preventative repair). When the thermostat fails, the pump isn't usually far behind. Ultimately it is up to you, you can make your own decision. Please kindly select a positive rating so that I receive credit for my time and answers. Thank you