“approved method of electronic communications”, in relation to the delivery of information or the making of a payment in accordance with a provision of these Regulations, means a method of electronic communications which has been approved, by specific or general directions issued by the Board of Inland Revenue, for the delivery of information of that kind or the making of a payment of that kind under that provision;

“official computer system” means a computer system maintained by or on behalf of the Board of Inland Revenue or an officer of the Board.