I've found this little snippet from the Minutes of a recent meeting of the Devon & Cornwall Constabulary Firearms Liaison Committee to be a bit of a puzzler:
".........advised the meeting that any boar that had escaped from a farm were not classed as “wild” and could only be shot with permission from the owner. However, if any of these animals enjoying their freedom should breed then their offspring would be classed as wild. A certificate would need to be varied for the shooting of wild boar. The meeting was also advised that any certificate holder that wishes to shoot wild boar would have to contact DEFRA. Shooters would need to be authorised to shoot wild boar and would need a letter from DEFRA, authority from their owner and a suitably varied certificate."
Couple of points:
Firstly: If wild boar were 'escapees' and on A N Other's land why would you need the permission of the original owner, (if he could even be traced )?
Secondly: Anybody posting on here have such a letter from DEFRA or even heard of such a thing being a requirement?