Hi, Can't help with Thomas, but William Bowman was a farmer in Elvington, Nr.York, farming 120 acres and employing 2 men. (Born in Sutton On Derwent)
In 1861 he was listed as aged 68
Wife Harriet aged 52
Son John aged 30 - Veterinary Surgeon
Daughter Mary aged 17
Daughter Emma aged 14
Son George aged 10
They are actually listed as Browman on the census, but are definitely Bowmans.
Hope this helps you.