We have lived in our house for over 30 years and always got on well with neighbours on both sides. "New" neighbours moved in around 15 years ago and from the start started telling us what we should and should not be doing. We got a new larger conservatory about 10 years ago, it is a permitted build does not go right up to the boundary line (which is our fence) but suddenly the neighbours have complained about the amount of moss which somehow bounces over the 6ft fence onto their patio from our conservatory roof - it does not, the magpies love to sit in the guttering on all the house roofs and fling the moss down - it lands on our conservatory roof (and stays until we remove it) and also their conservatory and patio. They wanted us to put up a screen or higher fence. They have now decided to put up 4 9ft fences themselves on their side of garden, but hard up against our fence, they have put fence posts in and made an 9ft frame and started to put panels in for a fence - we asked if they had planning, which they didn't and then proceeded to tell us the conservatory is an eyesore, they have to look at it from their conservatory, the gutter brush was ugly, its too near their house - so trying to be nice neighbours, we removed the gutter brush and always keep the side pannels down the side facing them clean.
We have not been advised from planning department so assumed it still in the process. They went away for a month, came back and within a week another frame went up - again we asked if they had planning and they say they have put it in, we did tell them that just because they've put it in does not mean they can go ahead, to which they replied that one of them had slipped on the moss. The problem is that we can now see this "fence" from every room at the back of our house and through our conservatory roof - we have had to change around the conservatory seating area so that we can not see it, but is difficult as we work from home in there. They have now hung christmas lights onto the frame - having never had lights before, which when switched on shine into all our back windows and lights up the conservatory - now, I like christmas and christmas lights, but don't expect them to be above me. They have been trying for years to get an extension, but as they spent out for a tiled roof to their conservatory they couldn't afford to extend. I Really do not know what to do.