no later than 32 working days from receipt by the new supplier of the information  in sub-paragraph (a)(i) and (ii).  6ZB. —(1) This regulation applies where a new supplier proposes to complete a supplier  transfer.  (2) This regulation does not apply where a customer is transferred to a supplier appointed  by the Authority following a last resort supply direction being given within 21 working  days of an agreement reached in accordance with regulation 6C(1)(b).  (3) Where this regulation applies the new supplier must only complete a supplier transfer  where there is a valid contract with the customer who is subject to the supplier transfer.  (4) For the purposes of this regulation, failure to meet the standard of performance in  paragraph (3) is determined when the old supplier and the new supplier have agreed that the  customer has been transferred without a valid contract.”  6.  After regulation 6C( a ) (Resolution of erroneous transfers) of the Principal Regulations  insert—  6CA. —(1) This regulation applies where a supplier no longer has responsibility for the  supply of electricity or gas to the customer where—  (2) This regulation does not apply where responsibility for the supply of electricity or gas  to a customer transfers from one supplier to another supplier without a valid contract.  (3) Where this regulation applies in circumstances where a customer transfers to another  supplier under a valid contract, the old supplier must within 6 weeks of the supplier no  longer having responsibility for the supply of electricity or gas, issue the customer’s final  bill.  (4) Where this regulation applies in circumstances where a supplier’s responsibility for  the supply of electricity or gas to the customer has otherwise terminated, that supplier must  issue the customer’s final bill within 6 weeks of the later of the date on which—  7.  In regulation 9 (Exemptions and limitations to supplier payment obligations) of the Principal  Regulations, after paragraph (7A)( b ) insert—  “(7AA) A supplier is not obliged to make a standard payment following failure to meet  the individual standard of performance under regulation 6ZB, where—  Avoidance of erroneous transfers  “Provision of a final bill  (a) a customer transfers to another supplier under a valid contract; or  (b) a supplier’s responsibility for the supply of electricity or gas to the customer has  otherwise terminated.  (a) the supplier no longer has responsibility for the supply of electricity or gas; or  (b) the supplier is notified of no longer having responsibility for the supply of  electricity or gas”.  (a) a customer has withdrawn a request for a supplier transfer after the supplier  transfer has completed —  (i) in accordance with any term in the contract between the new supplier and the  customer, or  (ii) by virtue of any enactment, or  ( a ) Regulation 6C was inserted by SI 2019/218.  ( b ) Regulation 9(7A) was inserted by SI 2019/218.  3