Here is the deal, instead of buying a coffee at Starbucks buy a bag of coffee and get any tall drink for free.
To me this is a no-brainer if I buy a dark chock moka its £3.40 but buy a bag of coffee for £3.80 to use at home and I get a free tall drink, my dark moka is £3.40 so net cost of bag of coffee is 40p
For me I'm going in for a drink anyhow so look at it as a bag of coffee for 40p.
please note to get this deal you must use a startbucks card (its part of their loyalty scheme), if you dont have one pick one up in store.
With Starbucks Card Rewards, every time you use your card to pay for a beverage, you can enjoy free customisation (extra shot, syrup, soy and whipped cream). And when you buy a bag of whole bean coffee with your card, you get a free tall handcrafted beverage of your choice.