1851 and 1861 have not to my knowledge been released yet on CDrom, so I'm afraid it's the old fashioned way of looking at microfilms for those.
But if it helps in 1841 HO107/449/01 folio 39B Queen Victoria public house, Somersham William Thompson 38 publican Mary Thompson 35 William Thompson 10 Sarah Thompson 7 same house but a separate household Edward Thompson 20 ag lab
All born in Hunts
No other William Thompsons in Somersham, so assume this is probably the right one.
Regards
David
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Census information is Crown Copyright, from www.nationalarchives.gov.uk Beds: Cople: Luke/Spencer Everton: Hale Henlow: Cooper/Watts/Sabey Potton: Merrill Southill: Faulkner/Litchfield/Sabey Woburn/Husborne Crawley: Surkitt Hunts: Gt Gransden: Merrill/Chandler/Medlock Toseland: Surkitt/Hedge/Corn Cambs: Bourn: Bowd Eltisley: Medlock Graveley: Ford/Revell