Another one was the person who's neighbour had created a door into her outside space.
That was Span Gran, a made up thread. It's infamous.
In the context of the popular UK parenting website Mumsnet "SpanGran" (Spanish Granny) is a legendary, fictionalized character born from a famously viral "Am I Being Unreasonable" (AIBU) forum thread in 2017.
The Backstory
The saga—often referred to as the "CFN" (Clueless/Cult-like F*wit Neighbour) or "Tape-Gate" thread—followed a forum user ("Watty") who was dealing with nightmarish builders and a boundary dispute. After returning home to find her garden invaded and property damaged, she called her grandmother in Spain. The forum imagined the grandmother as a fiery, paella-pan-wielding matriarch coming to her granddaughter's defense.
The Mumsnet Phenomenon
The Mythology: The Mumsnet community eagerly rallied around the updates, humorously tracking the "arrival" of SpanGran, her paella-making skills, and her beloved "sangria".
Enduring Legacy: What began as a genuine plea for advice turned into a months-long saga. The character became a beloved inside joke, with forum users referencing SpanGran in follow-up updates well into 2018.