We live in a Grade II listed building barn conversion attached on two sides around a quadrangle courtyard. Next door's wooden guttering is leaking and the want to replace it with aluminium guttering. Several problems with this 1) aluminium goes against the listed building status, 2) aluminium guttering cannot be joined to wooden guttering and so would cause further leaks where joined with our guttering and their neighbours the other side 3) the other neighbours are 'renters' as the owner lives and works in Switzerland, 4) the neighbours the other side of us just want the guttering fixed not replaced - especially as they have doves nesting in the end of their guttering and finally 5) the main join would have to be above the downpipe on our property. I don't want to fall out over guttering but they really won't listen to the inevitable problems and have said "I'm not bothered about the listings people." I'm tempted to ring the listed buildings people for advice but have been advised that they will come round and check everything, not just the guttering, which could mean problems for another neighbour who has an 'illegal' chimney. It's a bit stressful... Any suggestions how to tackle this?