Re: Signs and Signals regs:
4.—(1) Paragraph (4) shall apply if the risk assessment made under paragraph (1) of regulation 3 of the Management of Health and Safety at Work Regulations 1992[4] indicates that the employer concerned, having adopted all appropriate techniques for collective protection, and measures, methods or procedures used in the organisation of work, cannot avoid or adequately reduce risks to employees except by the provision of appropriate safety signs to warn or instruct, or both, of the nature of those risks and the measures to be taken to protect against them.
So the fire risk assessment part of MHSW regs was changed over the RRO, so para 4 only applied on a risk assessed basis.
(3) Without prejudice to paragraph (1), sub-paragraphs (a) and (b) of paragraph (4) shall also apply in relation to fire safety signs where they are required to comply with the provisions of any enactment (whether in an Act or instrument).
Paragraph 4 (a) and (b) are the ones sending you to the schedule concerned, so if the RRO doesn't actually require them then it doesn't matter.