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... would have gone red by now. They start off yellow in July, but change colour in August.
The fact that these ones are still yellow in late September, along with the colour-changing leaves, suggest that it's a more exotic Rowan, and it may well be the suggested cultivar.
How to take close-ups with cheap phone and hand-lens:
Field Guides for Budding Botanists:
Lat/Lng: 54.2028, -2.8327
OS grid ref: SD457788