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... a swede (Brassica napus) or a fodder beet (Beta vulgaris). On the other hand one wouldn't expect fodder beet in this situation.
It has grown among the beetroot in my father's garden. Could it have been among the seed by mistake?
... and fodder beet (and sugar beet) and beetroot seed probably looks rather similar.
Lat/Lng: 53.1418, -1.811
OS grid ref: SK127605