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Uh, ok. That's not was I was told at all, by several people in fact, including a land owner, & a fencing contractor who'd said it might be easier to attach panels to the existing fencing ! Would've thought they'd both know what the hell they were talking about !!
Thanks, though not really sure what I do now. If I put up separate fencing, he'll take his down & "enjoy" the extra land (despite that link woofgang), too much hassle for too little gain :(