Jim
Thats pre the 2007 amendment which can be found here
The Rules of the Air (Amendment) Regulations 2007 No. 1371
It modifies rule 28(5) to read
(5) Paragraph (2) shall not apply to a helicopter which—
(a) flies at or below 3,000 feet above mean sea level;
(b) flies at a speed which, having regard to the visibility, is reasonable;
(c) remains clear of cloud with the surface in sight; and
(d) is in a flight visibility of at least 1,500 metres.”
This has an amendment bar next to it in the current rules of the Air.