I finally got a response from the House of Commons to my request for an internal review. The House in effect conceded that its original interpretation of the law was wrong and agreed to provide the information I had asked for. It seems strange to win an argument with a branch of the legislature on a point of law.
I did find out that the Clerk has been shopping at the Majestic Wine Warehouse, including (it would appear) purchasing 12 bottles of De Telmont Grande Reserve Champagne in January and 24 more in February.
I expect that the bottles were purchased for an event of some sort but it seems a bit excessive to be regularly buying Champagne at tax payers’ expense.