Ben
Their are 29 Lyon/s in St Pancras in 1841........none of which live in Clarence Court, one named Elizabeth aged 40 lives in Clarence Gardens as seen below
1841
CLARENCE GARDENS, MARYLEBONE, ST PANCRAS
ELIZABETH LYONS 40 IND N (NOT BORN IN COUNTY)
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If you know more (post being a year and a half old!) reveal all
Bryant