Small tree found in sparsely wooded area at edge of WWT Arundel site on a cold, windy day.
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But I'm not quite sure from the photos if it's Common Alder or Italian Alder (Alnus cordata).
The cones of the latter are larger than those of Common Alder (hard to tell unless side by side!) and more barrel-shaped.
From your photo, could be either.
In fact, from the photo, the cones could actually be sessile, in which case it's Grey Alder (Alnus incana), which is more at home in dry conditions than other Alders. If your sparsely wooded area was not particularly boggy, this could be your tree.
But it's definitely Alder!
How to take close-ups with cheap phone and hand-lens:
Field Guides for Budding Botanists:
Many thanks Rachy for your comprehensive feedback; as I recall it, that particular area of ground wasn't boggy. John
Lat/Lng: 50.8631, -0.5509
OS grid ref: TQ020080