Thank you for your reply.
1 The fence does belong to my neighbour
2 The neighbour removed part of the fence (about 8 feet of it) leaving the gap. He then tarmaced beyond the point the fence previously occupied and against my brick pillar that supports my gate.
3 I have copies of two letter, the first of which included the pictures.
The complaint is that the neighbour has taken over part of my land (though only about eight inches) but this caused me a requirement to cover the gap with a fence that I constructed. I did attempt to replace the fence in its former position but my neighbour had it removed and warned me that any construction on or beyond the brick pillar would be removed - effectively banning me from taking back my strip of land.
I look forward to your comments, please. ***** *****
Nothing in writing, yet, but verbally I have informed him that the boundary will be corrected.