Hi Steve, there was a John Hannam (no middle name given) who was sentenced to seven years transportation in 1801, aged 39 (See the Old Bailey website). According to convict lists on another site this John Hannam was 31 and was 'pardoned to quit the kingdom', which I presume means he had to leave England for good. Where he ended up is anyone's guess although given the year it is likely to be America.
Regards,
Craig.