Will not run after replacing Alternator/Water pump belt

Follow the belts around and look for a connector that was knocked off/loose or wiring damage. It is easy to hit one when you are trying to route the belt and not even notice it.

You changed only the two accessory drive belts correct and then it would not start? The only thing I can think of is either a wire broke or a connector failed. Not much else on that area of the engine that can cause a problem. There are a couple grounds that control things like the fuel pump and the main relay that run in the area. When you turn the key "on" do you hear the fuel pump run at all? If not that would suggest that the ground had failed.
Or it could be some real odd coincidence that something else failed.

Maybe a run through the fuse panel would show a blown fuse.

Check to see if the fuel pump is turning on and that you have pressure.
https://www.2carpros.com/articles/how-to-check-fuel-system-pressure-and-regulator
Also you could put a spark tester on each wire and see if you have spark.

Beyond that the only thing I can think of is something failed just at the wrong time. Because that car isn't sold in the US with that engine (we got the 1.8) it's a bit more difficult to diagnose. It is up to you on how far you want to go.