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...if there hadn't already been an ID, I would have gone with Ghost Bramble, but as it is, from just a photo, sticking with just Bramble is the best bet.
Unless (being in a botanical garden) it was labelled.....
How to take close-ups with cheap phone and hand-lens:
Field Guides for Budding Botanists:
Lat/Lng: 52.1, 0.1
OS grid ref: TL4557