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It did seem to me that the leaf shape was not quite right for Bellflower and the flowers were not growing in clusters but individually.
Your comments are valid for the UK bellflower (harebell) but the genus shows a great variety of leaf and flower shapes across the northern hemisphere, many of which have been introduced into UK gardens.
Lat/Lng: 50.72068, -1.84965
OS grid ref: SZ107912