… they just want to check the main land as being suitable (for the calibre, for the species present, etc) to establish good reason for the application. Being pragmatic I’d suggest going along with it for the ‘good reason’ justification on a suitable bit of land and then allow them to grant it as being open calibre. Thats what Kent Police done for my 6.5x55
“A person wishing to shoot over land should nominate in their application a specific area of land over which they intend to or have permission to shoot (this does not restrict their ability to shoot elsewhere where permission is also given), and provide written authority, where appropriate, from the person entitled to grant the shooting rights. The land may then be examined and approved by the police (if it is not already known to be suitable) in order to help to establish that the “good reason” requirement has been fully met, and that the use of firearms and ammunition will not endanger public safety or the peace (section 27(1)(c) of the 1968 Act).”