Seemingly open to anyone this time by using the code SAGATASSIMO
Purchase one black Tassimo T4 bundle at the promotional price of £40 (plus postage and packaging of £5),which includes:
1 black Tassimo T4 machine;
1 Costa cup & saucer;
1 Costa Americano T DISC pack (16 T DISCs, 16 servings)
1 Costa Cappuccino T DISC pack (16 T DISCs, 8 servings)
Credit to Katiehound on MSE forums.
£20 credit when you register online
I just thought it might be worth mentioning on this deal that you may need to register a new account to get the £20 voucher if you have already registered a machine on your account. I.e. you need a different email address.