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Having an ethics adviser is a matter of convention, not a legal requirement.
My house, my rules?
EPA-EFE/UK parliament/Jessica Taylor handout
The Conservatives have always been happy to rewrite their own rules when it suits them.
Nicola Sturgeon at the beginning of her evidence to the cross-party committee.
Andrew Cowan/EPA
She defended herself robustly and humbly admitted to errors, but the first minister is still on shaky ground when it comes to crucial questions.