At the end of the day it's a means of demonstrating your competence, which might make it easier to get work of this type. In business terms, if you're in that business already & you don't get asked for it, or told you're losing work because your competitors have it then you probably don't 'need' it.
People have dismissed schemes like this but personally I don't see there's any reason why being trained and accredited to inspect or verify passive fire protection is any less worthy or necessary than being accredited to the same extent for detection or suppression. There are certainly loads of people out there inspecting such kit on the basis of old wives' tales, including measuring how deep the door stop is, judging how 'heavy' a door feels, & by rapping it with their knuckles! They haven't even heard of BS 8214, in many cases.
I'd be surprised if we don't see a significant expansion in organisations offering passive fire protection maintenance & inspection accreditation - there's an obvious gap in the market. If this happens you'll start to see clients asking for it. Whether this is the creation of "jobsworths" is really down to the industry to judge.
I have to add that I've no knowledge, experience or affiliation to the scheme in question. I'm simply offering a view that there's an opportunity for the passive fire protection industry to start catching up with the active stuff, in terms of inspection, commissioning & maintenance. There's fundamentally no reason why it shouldn't be normal for a fire door to have a maintenance sticker on it in the same way as fire extinguishers do. Why not have a PFP maintenance log in the same way as we have fire systems log books? They're all subject to the same maintenance requirements under UK legislation & for some risks a decent fire door could be much more important than a working fire extinguisher!
