Did they leave you with the shower screen and any spare wall panels? Those are quite straight forward to do just annoying to have to spend the time doing it. I'd just get a trade in to plaster the ceiling. If you have an Oscillating Multi-Tool or a mate you can borrow one from then a small slice off the bottom of the door frame either side on the shower room side will make it easier to replace the broken floor tile next to the threshold. Taps on the sink are easy enough with some tap tails and a couple of adjustable wrenches to nip them tight. Some plumbers mate around the sink hole before dropping the pop up waste in there and doing that up hand tight, then just connect up the trap and the waste pipe. A bit of straightening up of the rad fittings and maybe the loo seat and I think your done.
EDIT: and a bit of bathroom white silicone around the back edge of the basin and around the base of the toilet pan.
He took all the the fixtures and fittings they were still to fit away with him - everything, nothing has been left that wasn't already stuck down.
This is what it looks like this morning:
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