Found the reason for the squeaking noise.
1, it appears the hydraulic tensioner is leaking so that needs replacing.
2, It also appears that when the belt came off it has sheered off a bolt. I'm not sure on the name of the part but starting from the front of the engine you have the fan, that is connected by a rod to a pulley that is driven by the aux belt. Well it is that pulley that is missing a bolt head. You can see the black rubber marks where the belt hit it and the clean surface of the broken bolt which suggests it was a recent thing.
So fark!
1, it appears the hydraulic tensioner is leaking so that needs replacing.
2, It also appears that when the belt came off it has sheered off a bolt. I'm not sure on the name of the part but starting from the front of the engine you have the fan, that is connected by a rod to a pulley that is driven by the aux belt. Well it is that pulley that is missing a bolt head. You can see the black rubber marks where the belt hit it and the clean surface of the broken bolt which suggests it was a recent thing.
So fark!