Had a read up and a FAC is Fire Arms Certificate and is only needed when you have a gun over 12lbs. I have land to shoot on already but rabbits are getting wise, so need to rest it for a while. Also pics of gun please ;-)
Tell them you will buy it back for £500 and they can give you the rest in cash and have it repaired ;-)
Better the devil you know with landyz. No two are the same