A few months ago, Covid 19 mitigation might have been a feasible reason for the measures. However, the justification would need to be how the measures are justified with respect to the people working in the office, their vaccination status, who else uses the office etc. In order for the assertions to have any validity right now, they must come from either credible guidance or some form of valid risk assessment. The Clerk's assertions need to be challenged by the Councillors so at the next meeting, an agenda item "Office use" should go on the summons. If the Clerk cannot produce either, they must modify their stance.