Yup, even Costa Coffee has decent cold brew. In my opinion it is very hard to make a bad cold brew, compared to espresso. You just take OK coffee and let it sit for 12 hours. Bingo. With espresso - in Starbucks the make the "american espresso" that quite sucks. It is large and burned.
Also Starbucks french press is pretty decent and good value for money, but it is on "secret" menu and you need to ask for it.