Update:
Tonight we removed the gearbox and clutch
And started to removed the belt and covers for the cambelt on the other side
Now I'm pretty convinced that the cambelt is simply not doable without removing the engine. It's got so much in the way in the first place, then you've gotta run the belt etc.
Either way, PITA...
We got a bit further than pictured, but my phone memory was full and we were both shattered so just came home.
Rock on tomorrow