In light of the changes introduced as part of the Faster Switching Programme, we believe it is appropriate to review the SLAs and lead times around the sending and receiving/processing the ONAGE. There has been a change for Gas Suppliers, out of the Faster Switching programme that requires the Supplier to be able to process the inbound TMC from Xoserve and issue the outbound ONAGE to the MEM within the same day to able to supply change on the same day. However, there has been no corresponding consideration/instruction for the Gas MEMs needing to reflect this switch on that same day. The current instruction states that a MEM has two days to respond (accept/reject) to the ONAGEs, but this could leave the site MEMless, for a number of days, depending on the effective from date within those ONAGE(s). It’s our understanding that the de-appointment should be effective earlier than the appointment, also no overlap and therefore some consideration to these flows being issued in the correct sequence, without allowing for a gap where there is no appointment at all. We consider this a safety issue - if the meter were to require a visit/attendance, there would not be an appointed MEM to arrange this/notify/approach.