Hi Guys,
Might I just surmising, information is requested from the school? This would give you a greater insight into the reasoning behind this decision. My partner is a school teacher, and some of the things I hear do make me chuckle. The "Safety Adviser" for the school is an ad-hoc person, who also deals with HR, and has little or no knowledge of Health and Safety.
If a suitable and sufficient risk assessment has been completed, it would in fact, probably pointed to both the Regulatory Reform (Fire Safety) Order Article 14 (Safe means of escape), and the Workplace (Health, Safety and Welfare) Regulations, Regulation 10, Regulation 12, in particular.
Unfortunately, I think you school may have a valid point. On the other hand though, I would question the management of Health and Safety? Why, if this is common knowledge of leaving children outside, and holding books etc, have some sort of arrangements been made to combat this problem? This is the question I would be asking.
Could they not provide a canopy area, perhaps something gated, in which it could be organised that a rota is put in place between the mums?
I do understand your frustration. It`s like what I say to the guy`s at work "I may stop you from working unsafely, but this is only half of my job. If I stop you from working, there is a reason, but I will always have a solution, otherwise I will only be completing half of my job role."
This is why Health and Safety gets a bad name, because you have people uneducated in Health and Safety leading others. "The blind leading the blind" comes to mind.