Ok, Costa isn’t exactly a money-saving destination, but if you’re partial to the odd coffee and cake from there you might like to know at the moment they’re doing a periodic deal where if you buy a £20 gift card you get £5 free, effectively giving you 20% off everything you buy with it. I always get one when they’re on offer - you can also top up an existing gift card.
Also, if you don’t have the app, you get beans with every drink. At the moment it’s 8 beans for a free drink but in August it’s changing to 10 I think. However, with a reusable cup you get two beans so that would be one drink free after buying 5.
Here is a link to download the app - Use the Costa app like me and get 1 bean to start, then 5 more with your first purchase of a Costa handcrafted drink. That’s halfway towards a free one. https://swf3j.app.goo.gl/ctqrN Full
disclosure - I get a kickback of free beans with that link too. Don’t feel obliged to use it!