As an unlicensed airfield Popham are unable to publish NOTAMs.
I've read this here before. However, having spoken to the authority at Gatwick, I was told that
anyone can request a NOTAM to be published.
At the time I was enquiring about a "permanent" NOTAM, about kite flying from a strange location on a regular route I flew. It was supposed to be active every day, from sunrise to sunset. Having got in touch with the individual concerned, using the phone number supplied, I discovered it was unnecessary because it was requested by a hobbyist who had given up flying kites at low heights from there, so there was no need to avoid the area at anywhere near the published altitude.
I also queried another one about kite flying, this time requested by a chap training hawks to fly to a lure, with no other aviation connections.
Obviously, neither were operating a licensed airfield!