What used to be a dead tree in Bingfield Park is now an insect farm. The Greenspace folk at the council (thanks to Ranger Lawrence) have been trying to figure out ways to improve the park's biodiversity. There is very little cover or food for birdlife.
So they chopped down a dead tree and, instead of throwing it away embedded it to rot down naturally. The decaying wood will attract insects. Which will feed the birds.
If you haven't been up to the park before it looks lovely right now in the Autumn. The community has invested a lot of time and effort into rescuing the park from urban decay (it used to be a race track for stolen mopeds). Bingfield Park is just off York Way – turn down Randell's Road and there it is. (map)