Horton's halftime iceberg
Blooming Marvellous
I have no idea but I get the impression that this is an aftermath of Grenfell as I cannot see anywhere that it is a legal requirement to have fire doors on your flat door unless it is a purpose built block of flats, hence my starting the thread. She has a friend who is a fireman and apparently it is the Fire Brigade who make the recommendations anyway. She is waiting for him to respond.
Thanks to all those that have responded to my initial post.
I believe it is more the aftermath of the Lacknall fire (2009).
https://www.theguardian.com/uk/2013/mar/28/lakanal-house-fire-deaths-prevented
The report showed that old PVC type window frames burnt out within 5 minutes.
https://en.wikipedia.org/wiki/Lakanal_House_fire