When writing an estimated bill, the total for all eight billable items is £35.50, so well within budget.
However, when the bill arrives, even though the house red is cheaper at 3.68 than the 4.00 estimated, the bill total is for 37.18. As the 'service' section of the bill is empty, so the 'total bill' section should also be empty, awaiting completion by the customer.
Medway during the phone call with Susan Mandeville agrees to meet her for luncheon at 1:15 (presumably in the afternoon) yet Rinaldo the head waiter greets Medway at Blundell's restaurant with a "good morning".