Try Amber Belgian Candy syrup. That should give you a similar colour and be reasonably close to taste. Golden syrup tends to thicken beer slightly, your corn sugar will just thin it out. That's not what you want if you are doing a bitter.
See if you have any British sections in your supermarket, or look for shops run by people from Commonwealth countries. Shops such as Indian shops, Aussie or New Zealand. They are bound to have some in. May cost you a little, but still.
Alternatively, I will check the postage from here to Alabama. It may be ridiculous charges, but I will still look for you. It's about £1 a tin to buy. So it's the delivery that would be the bugger.