Cotoneaster microphyllus Small-leaved Cotoneaster DD I
This introduction from the Himalayas has successfully established itself at many sites in the UK. It sprawls over the lower sloping rocks of a cliff face at this site and is well naturalised. Unlike some species of Cotoneaster with insignificant flowers, this one can be quite impressive with it small shiny leaves and proportionately much larger flowers.
Stace reckons there is confusion between this species and C. integrifolius (Entire-leaved Cotoneaster) and makes the comment that material determined from Great Britain has so far all proved to be C. integrifolius.
Reference books indicate that the leaves in this specimen are too short to be C. integrifolius although other features fit both plants reasonably. I'll stick with C. microphyllus for the time being but Cotoneasters are a difficult group.