Not sure if this is a harlequin or potentially a ten spot?
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Apologies Markand Fran looked at this in haste and I think you are correct
It also has not the usual orange brown legs of The HL did you note the size at all ? As this will be an important factor in the ID Lit cites 3.5 - 4.5 mm for 10-S and 6-8 mm for Harlequin There is a good comparison on the link above - The pronotal area does not have the "usual" M configuration and white flanks also expected of the HL . It goes without saying that these normal characteristics apply to typical well developed adult specimens. I would suggest that this as you say is the 10-S. It is by the way a very good(Macro) shot and example of what is required when looking at Ladybirds
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This sent me to examine my specimens, and the majority of my 10-spot ladybirds have pale legs, and at least 3 of my Harlequins have the black M mark on the pronotum broken, with sections missing as in your picture. So I'm not taking sides in this debate!
At least in my series there is no overlap in size: the biggest 10-spot ladybird is still smaller than the smallest Harlequin.
Helen from @UKLadybirds has confirmed it as Harlequin.
"I can see the raised keel at the posterior end, and it has too many spots"
Lat/Lng: 51.3, -0.8
OS grid ref: SU9057