Council officials have found "historic breaches" of planning rules after examining the family cottage Dominic Cummings stayed in during lockdown.
Durham County Council received a string of complaints about the home Boris Johnson's aide travelled 250 miles to stay in at the end of March.
Now the council has said it found "historic breaches of planning and building control regulations". But it did not say what those breaches were, and said no enforcement action would be taken because of a time limit on doing so.
The council has referred separate complaints " in respect of non-payment of Council Tax" to the Valuation Office for "consideration and review".
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