Wasn't my original answer good enough for you?
As I stated before, the USA does NOT recognise the concept of 'rehabilitation' and consequently no offence can ever become 'spent' for the purposes of entry to the USA. Proof here:
http://london.usembassy.gov/add_req.html
Further, as I stated before, the UK does not routinely pass on information about criminal convictions to the US authorities. Proof here:
http://www.whatdothey...inal%20reply.doc.html
As I also stated, the usual advice here on AB is to simply 'forget' about any convictions and enter under the Visa Waiver Program (with an ESTA). There have been several posts, from people with criminal convictions, who've stated that they've entered that way with no problems. However there has been just one post from someone who believes that the US authorities were aware of his past:
http://www.theanswerb...l/Question912084.html
(That post is from someone who was convicted of an assault, which does not constitute 'moral turpitude'. He managed to enter the USA but, because of the terms of the US Immigration and Nationality Act, immigration staff would have had no option but to refuse him entry if he'd been convicted of a 'moral turpitude' offence, such as theft).
Chris