Ok let me confrim what CRC said on an email to me.
1: You can use MULTIPLE gift vouchers at once during checkout. So if you have 10 x £10 vouchers, you can add these all at checkout one by one to use them all up for one purchase or use some for one purchase, and some for another later in the year.
2: Using gift vouchers at checkout, the total basket value has to exceed the value of the vouchers, so they can only be used for part patment. i.e. Say you buy something for £101, then you can only use £100’s worth of vouchers. This pretty much goes without saying.
3: You CAN NOT use gift vouchers at checkout for payment IN ADDITION TO DISCOUNT VOUCHER CODES.
4: Gift vouchers still work on items heavily discounted individually on a price you would normally pay anyway.
They may stop doing discount codes in the sales anyway. But say they do one where you get 25% off using UK25% or something, you can’t use that as well as your gift vouchers for payment. It’s one or the other.
CRC emailed me these details themselves so I would assume them to be correct. 🙂