Out of interest, you say it happened around 10 years ago - has the neighbour been there that long? Or is it possible he inherited the land grab?
They've been there even longer. From what I can tell from Google earth there used to be a wide hedge at one point which was removed and a wall put up right up against my side.
How much land are we talking about ?
Hard to say really, but a traingular chunk maybe 6ft at its widest point.
Anyway sorry all for the slow response all, life has got in the way somewhat lately. Here are some pictures:
My garage on the left, theirs on the right. Eccuse the rubble I've been having some construction done. Towards the back you can see the wall they have constructed between the two which means I can't go down:
Land registry boundary, which I think shows I should be able to go down the side? It does differ slightly from the one @SeatIbiza got for me.