Well that turned out to be a bugger of a job. Seized nuts on the strut tops that that split the part the allan key goes in meaning no way to hold it. Angle grinder out to cut through the nut, and had to do the same on the second nut as the threads were all corroded.
Both strut bearing were gone, One so bad it would it would move left and right a good quarter inch,and the other was rusted solid.
It's a 2011, so 5 or 6 years old. Everything else underneath looks not too bad, clean-ish.
I've worked on a lot of older vauxhalls, and they have a similar front strut, and never had any trouble like this when changing strut top bearings or suspension components. I was really disappointed as a newer car is normally great for working on compared to old.
Anyway, where it all went wrong at the start:
New bearings (extra grease over them too!), shocks and springs anditsimply glides over bump and it should, not clatter and bang.
That's nothing really swapping engines out, or strip downs are much more fun.
The bearing that's not rusted looks to have split due to the damage. The new bearing had one bottom face and one top face. On the old one you can see the line where the bottom face (facing up in the photo) is in two parts, and that inner part is what was moving left/right.