Today, Right Units Limited has confirmed that the main entrance door is non compliant with the building regulations (2005-2006) and hence the door is not fire-resisting. They stated:
Hello Mr X,
With reference to your email, the replacement door that we fitted back in 2013 was supplied and fitted on a like-for-like basis as per Walsh Renovations instructions. As far as we know it is not compliant with the regulations in stated in your email.
Right Units Limited
Units 19/20 Empire Centre, Imperial Way, Watford, Herts WD24 4YH
Tel: 01923 224477 / Fax: 01923 211119 / www.rightunits.com