I just received my Siemens TK30 machine from Debenhams and sent off the £30 cashback voucher for it also.
They still have a few of these machines reduced and knocking about. They where £120 (nespresso themselves are knocking them out at £116) and have reduced them to £75, with the promo on you can get another £30 off to get it for £45
You won't find them at Debenhams.com, either call up and ask if your nearest store has one or order it with them over the phone, they told me it was limited but I still go it. Don't forget to mention of course that you have a gold card :D and get free delivery :D