Richie I can guarantee you that there's nothing wrong with my education, but both 'Prunella modularis' and 'Dunnock' are unkown to me. I've visited Wiki and have read that the name 'Dunnock' comes from the Ancient British. More common names are Hedge Accentor, Hedge Sparrow, or Hedge Warbler.
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If MA degree is not enough to recognise a sparrow when I see one, I wonder what is ...? Am eagerly joining the uneducated group against your nomenclature and ornithological overeducation !!! LOL Sheer everyday miracle - I do like them sparrers most of all [said Mary Poppins]. SAM & SAAB
Good catch