Thanks, Beaus Mum & Pansy Face. Artjak, Guardian article written in 2012 says it's an offence in common law to allow jap knotweed to encroach from your land onto a neighbour's, so I would have had a case in law against the people who were living there when we moved in. But I'd rather stay on good terms with the present incumbents & fight it together. As I said, we do seem to be getting on top of it - and as far as I know, nobody's had a mortgage refused because of it... Mind you, as my garden is across the street & down 15 steps from the house (think "Last of the Summer Wine"), maybe a surveyor wouldn't have noticed a bit of knotweed!
Since 2019 I've lived in east Clare, in the west of Ireland.
Oh, forgot my happy neighbour story! When we lived in Northumberland our neighbours kept a Tamworth pig on land next to our back garden. "Rosy" was lovely, always happy to have a chat and a scratch between the ears when I was outside - and delighted to be given any couch grass I found when weeding as it was her favourite food. She excavated and devoured all the couch & other horrors which formerly invaded my garden from next door...
Since 2019 I've lived in east Clare, in the west of Ireland.
Beaus Mum, I live just a few miles from where Summer Wine was filmed - steep and beautiful, though not really picture post card unless you like old mill chimneys... good for keeping fit though, 50 steps up to my house!! My neighbours all seem to wear trousers, no sign of Nora Batty
Yes, Rosy was lovely. Unfortunately one day she seriously damaged her back, cavorting round her field, and "went to live in the freezer"... she had a happy life though.
Since 2019 I've lived in east Clare, in the west of Ireland.
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Thanks, Beaus Mum & Pansy Face.
Artjak, Guardian article written in 2012 says it's an offence in common law to allow jap knotweed to encroach from your land onto a neighbour's, so I would have had a case in law against the people who were living there when we moved in. But I'd rather stay on good terms with the present incumbents & fight it together. As I said, we do seem to be getting on top of it - and as far as I know, nobody's had a mortgage refused because of it... 
Mind you, as my garden is across the street & down 15 steps from the house (think "Last of the Summer Wine"), maybe a surveyor wouldn't have noticed a bit of knotweed!
Oh, forgot my happy neighbour story! When we lived in Northumberland our neighbours kept a Tamworth pig on land next to our back garden. "Rosy" was lovely, always happy to have a chat and a scratch between the ears when I was outside - and delighted to be given any couch grass I found when weeding as it was her favourite food. She excavated and devoured all the couch & other horrors which formerly invaded my garden from next door...
Oh liri you got me thinking last of the summer wine now
Is it cos you live in picture post card place or your neighbour has saggy stockings? 
Rosy sounded like the perfect neighbour
Beaus Mum, I live just a few miles from where Summer Wine was filmed - steep and beautiful, though not really picture post card unless you like old mill chimneys... good for keeping fit though, 50 steps up to my house!!
My neighbours all seem to wear trousers, no sign of Nora Batty 
Yes, Rosy was lovely. Unfortunately one day she seriously damaged her back, cavorting round her field, and "went to live in the freezer"... she had a happy life though.
Bet it's lovely there, not the 50 steps though! Bad enough living on steep hill, I always get a taxi up
Awwww poor rosy
Franco maybe you could replace one leylandi at a time for something that does the job but you are liking more