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There are a couple like this that are deciduous so it is best to stick to species as it it is not possible to narrow down from this photo
...whether to go for species and "risk" your ID being over-ruled.
I think Sheila is right in this instance, there are quite a few types of cotoneaster: perhaps to avoid confusion, the original ID-er could make a comment to that effect when they create the ID.
*memo to self: remember to do this in future when posting Observations*
How to take close-ups with cheap phone and hand-lens:
Field Guides for Budding Botanists:
As having been around many plants etc for most of my life, I feel justified in stating it as such,having also weeded-out many spontaneous seedlings & plants in my time.
This one has a less regular herringbone pattern than is usual for Cotoneaster horizontalis, but calling it as Cotoneaster horizontalis agg. is reasonable. It doesn't appear to be Cotoneaster hjelmqvistii, which is the other species that turns up commonly (around here), but there are several other species in the group.
Cotoneaster is disparate enough that identification to better than genus is often possible - even if a definite species ID isn't. There is the salicifolius/x watereri/frigidus group (which is pretty disparate in itself), the bullatus/rehderi group, the microphyllus group, the horizontalis group, simonsii, and the franchetii/dielsianus/sternianus group (and a lot more besides).
I too can say the same I am a landscape gardener with a degree in horticulture plant biology and numerous other horticultural qualifications but this does not make any difference when there are a few very similar ones so I to feel justified I have been working with plants for over 40 years and I am very familiar with Cotoneaster's.
I'm very grateful for all the input above, and for the purpose of the birds/berries survey I need only get to genus level, so all's well in this instance!
I too am doing the survey for the BTO and the birds are eating frantically at the berries the cotoneaster's seem to have done well this year with berries they have nearly cleared all of mine and I have 8 different types.
Lat/Lng: 55.14, -6.69
OS grid ref: NW012928