Pret-A-Manger £2.25Very fast service. Accepted my contactless American Express card. Coffee different to Starbucks but of similar quality. Not labelled as Fairtrade so probably isn't.
Greggs £1.80Very fast service. Did not accept my American Express card, but offered me a cake for 20p extra. Coffee is OK, but not as good as Starbucks. Definitely Fairtrade though.
Costa £2.35Very fast service, good coffee. Accepted my American Express contactless card. Not clear if Fairtrade.
Social Bite £2.10Pretty slow service, but the coffee was good. No contactless card option and coffee not Fairtrade as far as I could tell.
I am not sure which one is the best option. The best compromise is probably Costa.