Fucking hell... Skirting and trunking corners should and can easily be mitred.
Please, please tell me they are Part P-certified for electrical work, or that you've had building control in to inspect and sign off the work (and the wall removal, if structural).
They've not been fully paid yet. won't be unless it gets sorted. Legit to ask them to fill in round down lighters right?
What are you supposed to do with the electrical trunking in corners and where it meets ceiling?
Also the wire to the extractor should be chased in no?
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