M
MJGas
I fully sympathise with the installer in this case; it's the neighbour who is a PITA: I was plastering the back door reveal the day the fitter was talking to him and heard him say "...your neighbour might well complain, if I don't fit one..." I'm assuming he meant a PMK, since I can't think of anything else he'd be referring to. It's my guess the neighbour deliberately told him not to, in order to p**s us off. Not sure if the grant he'd got (he didn't pay for it) would have covered the PMK - pretty sure if it'd been free, he'd have asked for half a dozen.
It all stems from a right of way he tried to claim over my rear garden, a few years ago (and lost.) Since then, he's gone out of his way to be an @sshole (doesn't have to go that far, actually.)
I should have complained at the time, but things had quietened down and I didn't want to stir things up again - the flue is only 140mm from the boundary and building control would have made him move it (as you say, the PMK can't be used to achieve compliance when it wouldn't, otherwise - though I'd be perfectly happy to settle for it.)
The only time we can open our kitchen window is when he's away - usually for six weeks over Christmas, in Egypt, Malta, the Canaries etc... (and yes - I did say he's on benefits ...)
The fact is if its within 300mm of the boundary, It's the installer that is wrong not your neighbour.