The plant you saw in Suffolk sounds like a begonia with mid-green leaves spotted in white and pendulous white flowers about 18 mm across. Two common types fit this description:
To confirm, photos are essential. Capture the whole plant, a close-up of a leaf (top and underside), and a flower if present. Send as JPEGs to a plant identification service or a local horticulturist.
Begonias prefer bright, indirect light, high humidity, and well-draining soil kept evenly moist but not soggy. Avoid wetting the foliage to prevent powdery mildew.
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