Joshua a big, big thank you from me - I used your guide to do the belts, tensioner and water pump (I also replaced the distributor at the same time). I owe you a beer if you are ever in London.
A couple of observations:

I had to get a special tool to lock the crank pulley. Even with heat and an impact gun it wasn't shifting.

I found I could get the engine mount out in one piece... a small shortcut

I bought an extra long 14mm spanner to get to some of those tight bolts

I didn't mess around getting tdc. I used another trick - three small blobs of paint on the old belt whilst in situ on the crank and cam pulley. Then, add blobs to the new belt - that way can immediately see both top and bottom of the engine are in time and you haven't missed a tooth.

Lastly the locating pins on my water pump stayed with the block mounting, so it was simply a case of offering up the new one and bolting it in. Bonus!

I strongly recommend this guide!