I've recently undertaken the NEBOSH Fire Cert.

I found it to be somewhat low-level, I've a good number of years under my belt as far as H&S experience is concerned (construction, extractive minerals, M&E and FM).
My concern and thoughts are that to come off the back of the NEBOSH Fire cert. into FRA would be extremely difficult, thoughts?

Now this is where the discussion really ramps up. three ex fire fighters attended my course, all, to a man, had stated that to continue offering FRA their employers required NEBOSH FC as a minimum.

I enjoyed the course tbf, I agree though that in my current employment 35000 rooms nationally (student accommodation, estate transfer, FM and construction) FRA and fire management is a daily function and therefore I am exposed to the topic

I would have a look at the courses run by Vulcan fire safety, I have completed their fire manager cert and advanced diploma, both focus entirely on fire risk assessments and have an emphasis on practical activities. Having also done NEBOSH fire, I thought these were much better for carrying out fire risk assessments.

That could just be thier own requirement, just like asking for CMIOSH or dipIOSH etc. I have completed a number of courses in fire safety and found NEBOSH to be good, not difficult but I enjoyed it.
I won't disagree that having training in a subject is good but it is not a requirement at present. I worked with a number of ex fire fighters and whilst thier knowledge of fighting a fire was good they struggled to grasp the concept of R/A not because of illegence but they came at it from a different angle.