Trouble is, once you've given the address, if their database shows "not cleared", then they can get straight in touch with the landowner. So your policy of "land owner does not need to know" is likely to come around and bite you on the bum, and could lose you a fair bit of goodwill for effectively going behind his back.
Basically, don't ever list a piece of land on an application or variation form unless the landowner is 100% happy for you to do so. A lot don't mind you shooting, but want nothing to do with forms, paperwork or police checks.
(I'm speaking as a landowner here).