Twinings Lemon Green Tea Bags cost £2.50 for 20 bags from Morrisons, which works out to 13p per bag. You can, however, buy them on offer for two boxes for £4, which makes it a bit cheaper.

I bought green tea from Sainsbury's, Lidl, Morrisons and Tesco and compared them with Twinings to see which was the best in terms of price and flavour.