I just had a visit from Dave (Police FLO) as I'm renewing my black powder certificate. All went well & am expecting the certificate soon.
He warned me that there is someone in the South West impersonating the police and visiting license holders at their homes asking to see their guns.
This has happened on two occasions recently. On one of these he actually got to handle weapons!
Just be wary and ensure just who you are talking to before you let them in!