Erandock
Sadly, this is no longer a greatcoat. It appears to have been crudely altered (i.e. butchered) for civilian use as a sort of "British Warm". It is now neither one thing nor the other, neither military nor civilian.
The lapels have been cut back; RAF metal buttons removed and replaced with leather ones; backbelt removed; and darting removed to lose the tailored waist.
What a pity. All character and authenticity has been lost.