The Ginkgo biloba tree that stands in the Moat Garden at Windsor Castle.
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... sorry, ECS65, I can't make out any details clearly enough to agree.
If you hadn't stated that it was a Ginkgo, I would have said it was a conifer!
Do you have any better photos? A closer view of the leaf would - obviously - make it a lot easier to agree.
How to take close-ups with cheap phone and hand-lens:
Field Guides for Budding Botanists:
Sorry it has taken so long, that garden is only open to the public during weekends in August.
I have now added two photographs of the leaves.
Cert Nat Sci (Open)
Cert Cont Sci (Open)
Clearly a Ginkgo, no doubt about it, thank you very much for taking the trouble to go back!
*clicks on "I agree" with happy smile*
Lat/Lng: 51.4838, -0.6048
OS grid ref: SU969770