Tim Watts wrote:

Never share any service with a neighbour that you don't have to! Ever...

My neighbour and I jointly replaced the soffits/fascias/guttering of our
houses about 7 years ago, I organised the materials, they borrowed a
scaffold tower and we shared the work.

There's a single run of guttering front and back, in other houses I've
known, the front gutter has a downpipe on one house and the rear is on
the other, but here both downpipes are on my house.

After we'd finished the work he asked me for copies of the receipts for
the materials and he'd square up, when I did so he struck-off his half
of the cost for the downpipes and outlets, on the grounds they were all
mine, cheeky git! I felt like putting a hacksaw through the gutter at
the mid-point and fitting two end-stops.