12.—(1) Any notice required or authorised by these regulations to be given to or served on any person shall be in writing and shall be sufficiently given or served if it is delivered to him personally or left at his last known place of abode or business or sent to him by post in a letter addressed to him at that place of abode or business.
(2) Any notice required or authorised by these regulations to be given to or served on an incorporated company or body shall be sufficiently given or served if given to or served on the secretary or clerk of the company or body. For the purposes of these regulations and of section 7 of the Interpretation Act 1978, the proper address of such secretary or clerk shall be that of the registered or principal office of the company or body.