Well that was a pain in the ass!
Tried to order from GS but when confirming payment method, apparently the details don't match their records even though it's the same card I've used on there for years. Nevermind I thought, I'll enter another card, these are also incorrect. I better ring the bank and tell them GS have decided all my cards are wrong so I need new ones. How about trusty Paypal, surely that'll work, erm no. I just get a blank page with the PayPal logo and return to GS text.
Finally ordered it as a guest using my GF's email and paid with the same card it said was incorrect 5 minutes earlier
They be geniuses at GS
At least the order is finally placed