My my my, GAME really have gotten into bed with Steam. You get double reward points for buying Steam Wallet money to spend in the Steam Winter Sale! That’s pretty awesome. Though from reading the fine print you can only get the double points once, so I guess buy a big bulk if that’s how you want to do it.
The most you can buy in a single code is £50, but I guess you can do as much as you want. I wanted to buy some keys for TF2, maybe I should just buy the voucher code instead?