Thanks for the reply, I was not sure who to contact. I'm going to give my neighbour one last chance to act then will do as you suggest. This is a difficult situation as these are my only neighbours for some miles and so far we have had a very good relationship.
My fences, dykes and gates are in good repair. My neighbour's fences not so good and sheep escape onto the road and get up my drive. My home is a long way from the road so I eject them through gates nearer my home. This has been a manageable problem so far.