Our invoicing system for Trade Effluent – TEIP – is designed to produce the most accurate invoices possible, which will always reconcile against Wholesale charges. Many customers want to know that their charges are auditable and can be tracked back to these Wholesale charges. Unfortunately, if the Wholesaler enters sampling data in the Central Market Operating System after the month in which it is due to be recorded, this gives rise to a change in charges. This is an issue affecting all areas of England, not just Castle Water. We prefer to always be transparent, and therefore will send a revised bill. We are working with the Market Operator to stop the late upload of sampling data, which we think is unnecessary, and hope that sometime soon we will be able to eliminate the need for these reconciliations.