Ok i called my uncle who is an inspector in the police and he says he highly doubts the usa would have access to uk criminal records to check.
I also doubt they would have any way of knowing if i dont declare it so i may just take the chance and keep quiet.
I didnt give my details to the embassay however they gave me an email addy for someone to email to see if they could help as it was a professional event and i gave them all details but i doubt they would forward this and i sent a reply stating this was a mistake and i didnt actually incur a conviction just points and asking them to disregard my previous email.
So i may just take a chance here!
If you do get caught you are arrested and have to pay your own way home or they detain you until there is a flight back.
This blog might get very interesting indeed :)