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Cable clamps are at the back of the wiring box, right at the top, partly hidden by the terminal numbers. Screws to secure them in place where originally packed in a small plastic bag with the orange wire links, but presumably are now lost.Excuse my ignorance, but which cable clamps do you mean - and how can I correct this?
View attachment 99982
There are strange connections in the nest pic! The four core flex appears to have an earth connection to terminal 6, and the two core flex has an unused terminal marked with an earth symbol next to where it connects.
Going back to the wiring box, there are two four core flexes where the black wire has been used as a neutral. This should be the grey wire by convention, and it should be marked with a short length of blue sleeving.
Similarly, the blacks should have been used for 'lives', and identified with a short length of brown sleeving.