Can anyone advise me on the definition of FD20 fire doors? Our council asked
us to ensure all our existing doors were FD20 doors when we submitted an
application to convert our loft into bedrooms.

We believe we have them - solid Victorian doors with (newly fitted) self
closers. Friends in our street who converted their lofts before us have the
same type of door, and the council was happy with them.

But because we managed to squeeze 3 bedrooms up therethe Building Control
Officers suddenly insisted we replace all our existing doors because they
can't be sure they'll last for 20 mins in a fire. Yet these are the same
type of door that were fine for our friends' lofts...

How can you show a Victorian door is FD20 equivalent? Can the council refuse
us a Completion Certificate given all they initally asked for was FD20s,
which we believe we have?

Not the most rivetting topic, but any help appreciated. Thanks.