I think this is another one of those well meaning ideas that are less use in the real world. Like people carrying 'permission' slips of paper.
These days it would be so easy to alter the name, picture and address on the certs. Any police officer stopping you can check ID and find out if you are a lawful holder of firearms using the police national computer. There is no-one else who has any right to ask me to produce my FAC/SGC. The only other time I ever produce it is buying ammo or guns and then a picture is no good. Your in date certificate scan could have been subsequently revoked.
The ONLY bit of physical paper that stops a policeman potentially seizing your guns is the original FAC.
I would be very worried if a police officer who had reason to believe you were on land you shouldn't be trusting a simple note from the farmer saying it was ok. It's bloody complicated knowing who owns every field in this area, there is no way on earth the police have a clue who owns which field in North Yorkshire. "I farmer Giles let Apache shoot my land" is meaningless. Yet some people seem to think they are the most important piece of paper to carry with you. I don't have any written permission to shoot. If a police officer took that as proof of anything they deserve sacking!
Couldn't agree more.
Was involved with the police following a MoP report of men shooting.
Never asked for my FAC/ letter of permission
OK, my car was parked in the field, behind a locked gate, and a check of the RO/PNC gave them the details before they rang my mobile asking me to meet them by the car. We had a chat about shooting - they said they knew little about "guns", they made a couple of notes for a NFAR report, and that was it.
Walked back, had a chat about the rifles/safety/quarry