looking for some advice. 15 years ago, we purchased approximately 10 square metres of land at the bottom of our garden from a closed down sport ground to extend our garden. land registry deeds updated and had to apply for change of use to residential garden. Fences erected to define new boundary. Neighbours in adjoining property (semi detached) have over the previous 4 years encroached onto the land behind them (using my fences as the boundary) in effect doing what we have legally done. They have also erected a large shed and bike storage and basically landscaped the land to the same 10 meter depth. They defo have not purchased the land and she thinks this is ok. I am irritated by this and in 2 minds whether to report to the council as a breach of planning. How much detail would I need to provide and how sensitive would they be to keeping my anonymity. I have a timeline of the changes made and also old Google images showing the original boundary fence.. what wud you do??