Thanks Tony, Mark,
We definately need the door glazed - there are no other windows in the entrance hall. The annexe is for an aging relative and they would like to see who is at the door when they answer it. Yep, it's the only room downstairs so will be a cold sink - but I'm putting a radiator down there to dry coats, boots etc. and keep it as warm as I can. I need it to be cozy throughout.
Ah, so you're suggesting taking an FD30 door (I've seen some glazed ones) and retro-fitting the insulation. This is a great idea but I'd like to keep the thickness down to standard if I can. Doing it the other way around, bringing an insulated door up to FD30 could just require the extra thickness of a few coats of varnish and that seems preferable to me.
The frame I fitted is FD30 and 2' 6" by 6' 6" which is about as standard as you could ask for:) The maximum thickness of door I could fit in the frame is 60mm realistically.
The silly thing is that the cars are parked on the other side of the ground-floor hall from the door - so there's no way a leaky fuel tank would cause a fire anywhere near the door. Bloomin' building control!
It's great to hear that I'm not alone in needing an insulated fire door. If it were just for me I'd definately go your way Tony, but my relative would be quite confused by a 150mm thick door:)
I've found that Rawlins Paints do an upgrade varnish kit which is pricey, but should do the trick. As the ground floor build is all externally clad in shiplap, I was going to use similar varnish on the walls so extending this to the door would be easy and I could save a bit buying larer quantities... that and retro-fitting fire-rated glazing.