Franks is the 'secret' ingredient in anchor bar sauce but as some others have said, Franks original + butter = close to as good as anchor bar.
Franks now also have a wing sauce which is pretty nice too.
Us brits make a right mess of wings usually, don't marinade or add any sauce during cooking. Gently heat the wing sauce in a pan and add the wings once they are cooked, mix until well coated and serve.
I still urge you guys to get hold of some anchor bar if you haven't tried it, I drive 40 miles to this place in Bristol to stock up on the stuff.
http://www.hotsauceemporium.co.uk/list.php?catID=4http://www.anchorbar.com/