[SarahSchilling]

I used to drink bigelow brand plantation spearmint tea all the time... awesome and cheap.

Here's a link to their site...although they sell it pretty much anywhere in the states....so maybe you can find it in a brick and mortar over there as well.
I'm gonna grab some at the grocery store tommorrow, thanks for reminding me.

http://www.bigelowtea.com/Catalog/Product/36/102/24/Plantation+Mint%C2%AE+Tea.aspx

Ingredients:black tea, spearmint