A melanic form of the very variable Hieroglyphic ladybird (form areata)
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doesn't look like the stock images, but I don't doubt your identification. I'd never have worked it out, but I suppose the heather is a clue.
That's the main reason I put it on - it's a really variable little species that the books usually don't really do justice to. The triangular white front corners to the pronotum are pretty distinctive - most other species have a white border all along the side of the pronotum
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Lat/Lng: 51.3808, -0.6104
OS grid ref: SU968655