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No keys. Yes tools.
Would get someone else to take over entirely but can't imagine anyone would be available faster than me. I can take the weekend and next week. It'll be done at the same rate they're doing it and I wouldn't be short 3 grand. As I said, all the bits I can't do are done (plastering/first fix plumb/gas/elec) and I have a friendly plumber 5 mins AWAY.
Main concerns are any legal issues with telling someone to fuck off after they've done 3 weeks of half finished work.
Do they have keys? and do they leave tools at the property?
To be honest, I'd tell them to take a running jump but I'd probably get someone else in to finish it, as doing it yourself isn't going to speed up the process.