Nope still valid, it seems to only work on certain systems. https://www.hotukdeals.com/deals/ibm-lenovo-thinkpad-x61-7674-12-notebook-grade-b-sch-trade-66-79-2gb-ram-80gb-hdd-1511406?ppp=60
Thanks for the voucher code, tied to the current price drops they have made this makes a lot of units a bargain. So much so that I had to post a deal. https://www.hotukdeals.com/deals/ibm-x61-12-notebook-sch-trade-66-79-4gb-ram-80gb-hdd-1502269
My purchase was grade B and £89 and worked for me.
works sometimes doesnt work other times, i think its to do with a min amount or just grade B vs C (so far its worked every time i've used it on a £50 of more grade B) cba to play with check out more to see what its limits really are