I e-mailed Atkins direct, and this is the reply I received:

"Dear Ecco66:

Thank you for your interest in Atkins products in the UK. We do not currently have any distributors of Atkins products outside of the US and Canada. We recognize the great demand for our products internationally and are in the process of preparing for international market entry.

We are preparing to make a limited selection of products available in the UK early next year and will be announcing the products and retailers carrying the line at that time. We are excited about the opportunity to make it more convenient for you to shop for Atkins products in your local stores. We appreciate your support and look forward to serving you in the UK in the near future."

...so it sounds like they are testing the water. Maybe it would be useful if we all emailed them just so they realise how much support there is here for low carb products. I have sent off and e-mail to Tesco, and written to Asda (they never seem to reply to e-mails) asking if they will be stocking Atkins.

Address for Atkins is support~atkinssupport.com