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Thanks for responses much appreciated,will have a look at the land registry site.I have a small scaled drawing that came with the mortgage documents but its quite hard to get an accurate measurement from.The house is the first one around the corner,so his back garden fence goes past 3 houses on my side.I'm the bottom house and the last part of his fence is out of line with the rest,it steps back my way by 12" compared to the rest of it.A quick measure from the drawing I have seems to put the rest of his fence in the correct location.The drawing also shows a straight line across all the gardens leading me to believe 12" over the back of the fence belongs to me.He has built right up to the back of the fence,a shed like lean to to store a motorbike,and the guttering is actualy pushing against my fence,and the building has made painting etc nearly impossible.