We are building on my wife's gifted site fronting the main road. it is an infill site and from the road there is gated access to land at the back of our site which may be used for her sisters to build on. This gated access will be inbetween our site and a neighbour's and is currently about 14 foot wide. Does anybody know how much width we would have to leave for access to a site behind ours? Also, would this have to be removed from our site location map for Land Registry title purposes?