We've got a strange checkout issue in Google Chrome (on Mac only). If you go to a product page and add to basket, and checkout as guest. You will get to a step where you can enter in your post code: http://o7.no/YBf9nA. Put in WS15 1UZ and click 'Find Address' and then press 'Continue'. You then get the following error pop-up: http://o7.no/YBfeYw. At this stage I am not sure how this can be fixed, any ideas would be appreciated. It might be worth looking at this code: http://is.gd/en8nrG in the crafty_postcode.class.js file.