Be aware that the law allows a shotgun certificate to be made coterminous with a firearm certificate but not vice versa. So if you leave your shotgun certificate to renewal you will have to pay £40 and if you ask for it to be made coterminous, it will be valid for a few months only. If you do it now it will cost you an extra £10 and be valid until your new FAC expires. SGC renewal £40, FAC renewal £40, coterminous renewal of FAC and SGC £50. Best buy is spend the extra £10 now and do the extra bit of paperwork.