After many happy months of water pump squeal the time came to sort it
Popped the cam cover off which reveals mine needs the 123-tooth timing belt
(if you have no chain and if the belt goes round BOTH cams then you need the 125 tooth belt)

Lined up the timing marks ready to start stripping stuff off

With the alternator and power steering pump loosened, drive belts off and covers off, the water pump was easy enough to remove

This pretty piece was troublesome - I cleaned the flange really nicely, but that other hole fits on the water rail passing behind the exhaust and takes a small O-ring. We got through three before it sealed properly

So here's the new timing belt kit (about £50 in 2024)

And the old water pump. Had fun wobbling the shaft, it was remarkable how much play there was

Here's a view from below, showing the bottom pulley removed. I also removed the bolt that holds the dip-stick tube, in order to get the plastic covers off

New belt went on realy nicely, and pump went in easily. Just be careful with the water pump and cover bolts - they're not all the same length

So other than that pesky O-ring it was a relatively easy job, about 3 hours in total