So, long story short:
Next door asked whether my car parking space (advertised for as "allocated parking" when I moved in) could be used for a skip for a few weeks and they'd give me their parking space instead. This is an area with very little parking space. Skip was filled within a day and stood there, filled and not touched, for a good few weeks.
Almost every day I came home neighbour was parked in their space despite the promise after skip arrived and after a few times of knocking and asking to park up I felt silly and started to give up, but asked when the skip would go - I was told the Easter weekend. In the meantime, I was left to either park my car on the pavement or across a dropped kerb behind the skip.
Nothing happened for two more weeks, so I approached the couple again and got told they don't know when it was to be removed; they thought it would have gone by now. I was fine with it and asked them to keep me updated. Another week, another "it should have gone by now". Then I saw the partner out in the garden, asked again and we ended up having a coversation where I asked them to phone the company and take it away as I know some will deliberately leave the skip to save on storage space. At no point was it mentioned that the thing was still needed and he seemed to be okay with ringing them up.
More time passed and the neighbours had by now fully taken ownership of their space back while the skip was still in my space. So, having had these conversations 3 times now and always having been told they thought it would have been collected by now I decided to take matters in my own hand and phone the company. I made it clear that I was a neighbour, NOT the couple themselves.
A day later the skip was gone.
Forward another 1.5 weeks and I am having a frothing neibour standing at my door threatening me with just about everything because they now need to hire a new skip as the builders hadn't finished. They want their money back from me.
AIBU to have stood my ground? Yes, I shouldn't have phoned without another confirmation with them, but a) they were taking the absolute piss and b) they kept telling me it should have been collected, not to mention c) the company took the skip back without confirming with them as well.