This is my first deal, so be gentle!
Using the vouchers for 10% off and 23.50 off (In that order) you can get both the Wireless Adapter (cheapest seen seperate at £54.99) and 12 Months Gold subscription to Xbox Live (cheapest seen seperate at £35.99) for just £70, instead of £100!
Just for note, on Amazon, buying these two things together is just over £90.
10% off: XX277
23.50 off: ZQ055