Do they actually have a formal, written declaration of conformity with 2006/42/EC which you have seen?
And I still think you should involve a professional gate installer - you may not be installing the kit yourself, but it is still, essentially, a DIY product, and the responsibilities and liabilities are serious. I doubt that any thinking, responsible, electrician would want to take it on if he didn't already have experience and expertise and was being asked to have a go on the basis of just reading "The Gate Safety Guide runs through the hazards, and outlines a code of practice". Might not be covered by the usual PLI an electrician would have anyway.
And I still think you should involve a professional gate installer - you may not be installing the kit yourself, but it is still, essentially, a DIY product, and the responsibilities and liabilities are serious. I doubt that any thinking, responsible, electrician would want to take it on if he didn't already have experience and expertise and was being asked to have a go on the basis of just reading "The Gate Safety Guide runs through the hazards, and outlines a code of practice". Might not be covered by the usual PLI an electrician would have anyway.