Location: East Anglia, UK.
Approximate size (including legs at full span; like in the image): about 3cm.
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It appears to be a Noble False Widow Steatoda nobilis
From http://britishspiders.org.uk/wiki2015/index.php?title=File:Steatoda_nobilis.jpg
It apparently is thought to be introduced to the UK, and there are some reports that the bite has caused some issues for some people.
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1$\begingroup$ I had suspected as much but I wanted to see if someone else would come to the same conclusion. In fact the spider in the image you have provided is pretty much a carbon copy of the one I have shown (although mine had a smaller abdomen). I have caught ~5 of these spiders this year so far; all of which have reasonably small abdomens compared to what I would expect on a false widow; I'm assuming that makes them males? I have caught one with a very large abdomen which was unmistakeably a False Widow Spider, but that was 2 years ago. $\endgroup$ – Neilos Jul 30 '17 at 19:08
