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How lovely to see the plumage so clearly, thank you!
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The very dark underside, with just a slightly paler patch on the base of the outer primaries, together with the very fresh overall plumage, suggests a juvenile, I think. Not necessarily a female.
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We've corresponded before, haven't we! The head was really creamy yellow, and as you point out, it was pretty dark below. Does the male juvenile look pretty much the same as the female, then? That's interesting.
As far as I am aware, juveniles cannot be sexed until they start to moult, towards their first spring. If they moult tail feathers at that stage, then the females show dark brown feathers and the males have some grey tone in the feathers. An adult female would usually have some paler feathers on the underwing coverts and the breast, and would show a contrast in the dark wing tip and paler base of the hand. An adult female at this time of year would also be in moult to some extent and would show a mixture of old and new/growing primaries and secondaries.
Lat/Lng: 52.08925, 0.05532
OS grid ref: TL409454