asked the Financial Secretary to the Treasury what control his Department exercises over allowances and frais de représentation made to His Majesty's Ambassadors in foreign countries; and whether unspent balances are returned to the Treasury?

Allowances and frais are subject to a careful annual review. The sums thus annually approved are paid in full and the recipients are not called upon to account for their expenditure in detail. The second part of the Question therefore does not arise.