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The best way to tell L.ovalifolium from it's wild brother L. vulgare is to look at the young stems - these are densely pubescent on L.vulgare but glabrous on L. ovalifolium. But you need a lens - the hairs are tiny!
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I checked the sample with a hand magnifying glass and couldn't detect the presence of hairs. How tiny is tiny?
The hairs on the young stems are, although small, quite obvious and numerous under a lens. Usually described as "densly hairy". I guess the hairs are about 0.25mm or less. Best place to look is on the flowering (or in your case fruiting) stem. Sounds like your ID is exactly correct!
Lat/Lng: 53.40745330838, -2.3355066776276
OS grid ref: SJ777901