I got my FAC back from North Yorks yesterday after applying for a variation. I wasn't aware that there'd been any changes to any legislation so when I saw there was a table showing the quantity of ammunition I could posses but no table of quantities to purchase I phoned up and queried it. Turns out that as of Monday, they now only state the maximum quantity you can possess and it's down to you as the FAC holder to police your purchase/holding quantities.
Seems like a decent bit of common sense to me. I just thought I'd pass it on in case anyone else's ticket drops and you think they've missed something of.