Well, after a month I’ve got him back.
I’ve made a video of before and after.
https://youtu.be/VeCP63Z3ggY
New harmonic balancer, belts, pullies, water pump, top engine mount.
The car is transformed! So much quieter, smoother and torquier.
You were all exactly right - just have a look at the condition of the timing belt. Dodged a bullet there...
Thanks all! It also took very much longer than he charged for.
Independent Volvo Specialists, Letchworth.