As this comes up quite a bit here is the difference between a 'closed' ('more restrictive') certificate and an 'open' (or 'less restrictive') certificate.
Note that it is dependent on the conditions PER rifle. It is possible to have a certificate that is open for one rifle and closed for another.
1) Closed Certificate
The condition contains the text "land deemed suitable by the Chief Officer of Police" or similar. The certificate holder needs to check with the police force applicable to the ground to see if the ground is cleared and if not arrange to have the ground cleared for the calibre in question.
An example 'closed' condition:
2) 'Open' or 'Less Restrictive' Certificate
The onus is solely upon the certificate holder to check that the ground is suitable for the calibre/scenario. They do not need to check with the police force that the ground is cleared.
An example 'open' condition: