I Searched the 1851 index and could not find this record. These are the matches it came up with for me.
1851 United Kingdom Census Sample
Viewing records 1-9 of 9 matches for:
Lyon*
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Name Residence
(ED, County) Birth Place Gender Age
Charlotte B. Lyon Kensington Tow, Middlesex Middlesex, England, Kensington Female 20
Edward Lyon Kensington Tow, Middlesex Middlesex, England, Shoreditch Male 57
Elizabeth Lyon Kensington Tow, Middlesex Middlesex, England, London Female 21
Elizabeth Lyon St George Bloo, Middlesex Middlesex, England, Marylebone Female 26
Jane Lyon St George Bloo, Middlesex Middlesex, England, Marylebone Female 27
Martha Lyon St Katherine C, Middlesex Middlesex, England Female 27
Robertson Lyon Regents Park, Middlesex Westminster, Middlesex, England Male 21
Thomas H. Lyon Putney, Surrey Middlesex, England, Bloomsbury Male 63
Thomas H. Lyon Putney, Surrey Middlesex, England, Bloomsbury Male 63
Can you double-check your findings, and I'll try again (if I still have access)
Pauline