variegated form of aquatic umbellifer in new planting of aquatic plants in semi-formal pond.
No identification made yet.
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If it's a new planting in a botanic garden it may be labelled, failing which the gardeners are likely to be knowledgeable about what they have planted. (When you find out, do let us know!)
... in that planting when I was there.
... for another visit ;) Enjoy! Have a good Christmas.
The pic's a bit indistinct but the Umbellifer looks a bit like this thing which is in the hort trade. You could try e-mailing Ness for confirmation.
Lat/Lng: 53.2733, -3.0444
OS grid ref: SJ304756