Steatoda nobilis (noble false widow) & it's a beauty! Perhaps not fully mature yet, the markings can fade as they grow.
Looks like we're in a shed/outbuilding? If so, it's worth being aware that they are around so that you don't accidentally poke/squash one with your hand, otherwise there is little chance of receiving a bite (which isn't dangerous or deadly in any case). They're pretty well established aroung the S & SE of England, often hiding away during the day & patrolling their webs from dusk onwards.
Certainly remove any that find their way indoors.
More info here...
Thankyou MWJB. This is the second one I found - I had a suspision it might be a False Widow but wasn't sure the abdomen was round enough! This one was found waiting for me on our garden gate handle - luckily somehow my fingers missed it whilst opening the gate to put the bins out in the dark last night. I am not keen of spiders at the best of times and don't fancy the idea of being bitten by one.
The day prior I found one in our strimmer. I have left them alone for now, but I think this one may need to find a new home so that it is a bit further away from fingers!
I wouldn't rely too heavily on that rumour! ;-)
The males tend to be a little more drab, with much smaller abdomens, often harder to tell from more generic spiders at a glance. Harder to tell the sexes apart when immature though.