Blackstuff, guess im lucky with Surrey as all my rifles were caliber only, it is hand written as VZ58 MARS Action on my cert, hope that helps when i got mine i had the same issue as surrey (me) and the met (RFD) didn't have it listed, not sure how you woudl get them to accept it except for them to speak to another force
Good luck, oh and it is fun by the way, each time i go on the range i have a smile, until i have to replace the ammo
