At the end of paragraph (2) of regulation 6 of the Non-Domestic Rating Contributions (England) Regulations 1992 there shall be inserted the following:
(e) that where in any period of 3 months commencing on 1st April, 1st July, 1st October or 1st January the authority has given a notification under paragraph (c) above of an amount calculated, the authority has not previously in that period given such a notice in respect of which the Secretary of State has informed the authority of his belief under paragraph (d) above in relation to the amount calculated.