I had what I thought was a False Black Widow in my conservatory. Shiny black but with a red hourglass on its back. Looking at online photos of them though, that wasn’t it. It looks more like a Black Widow but the hourglass is supposed to be on its lower abdomen.
This is a lace weaver spider. See here: https://www.falsewidowspider.org.uk/british-biting-spiders/lace-weaver-spider
I had what I thought was a False Black Widow in my conservatory. Shiny black but with a red hourglass on its back. Looking at online photos of them though, that wasn’t it. It looks more like a Black Widow but the hourglass is supposed to be on its lower abdomen.