I think, as others have said, you're getting it the wrong way around and the Open / Closed thing is not the issue.
Very simply, you need good reason to have a FAC for whatever it is conditioned for. So in order to get it conditioned for deer you need a good reason specifically for deer - your target use is not good reason for deer to be added. You need either stalks booked with a guide or ground you've got permission to shoot over. You won't get it conditioned for deer for the purposes of finding ground to shoot over - that's the wrong way around.
Under your current circumstances, I'd book a couple of stalks with a guide and provide these as evidence to vary your certificate to allow you to shoot deer and vermin (you never know when you'll come across a fox when stalking!). Go on a couple of paid stalks - it won't cost a lot in the grand scheme of things and you'll probably learn a bunch too.
The deer condition will almost certainly be granted on a closed basis ("over land approved by chief constable" etc). Don't worry about that yet. If you get permission and there's doubt over whether it's been cleared previously then check with police then and ask them to clear it if not. Loads of land is cleared though so honestly, worry about that bit later. Find the permission first - that's the hard bit.
Good luck!
Very simply, you need good reason to have a FAC for whatever it is conditioned for. So in order to get it conditioned for deer you need a good reason specifically for deer - your target use is not good reason for deer to be added. You need either stalks booked with a guide or ground you've got permission to shoot over. You won't get it conditioned for deer for the purposes of finding ground to shoot over - that's the wrong way around.
Under your current circumstances, I'd book a couple of stalks with a guide and provide these as evidence to vary your certificate to allow you to shoot deer and vermin (you never know when you'll come across a fox when stalking!). Go on a couple of paid stalks - it won't cost a lot in the grand scheme of things and you'll probably learn a bunch too.
The deer condition will almost certainly be granted on a closed basis ("over land approved by chief constable" etc). Don't worry about that yet. If you get permission and there's doubt over whether it's been cleared previously then check with police then and ask them to clear it if not. Loads of land is cleared though so honestly, worry about that bit later. Find the permission first - that's the hard bit.
Good luck!