Anyone who spends £10 or more in a single transaction at a participating ‘Shop Small’ retailer will receive a £5 statement credit.

The promotion kicks off on Small Business Saturday on 5 December and runs until 20 December.

In order to get the offer, shoppers need to enrol first. This can be done via the Amex app from 4 December or you can register your American Express card by clicking on the ‘save to card’ tab.

Cardholders can use the deal a maximum of 10 times (once per participating shop) earning up to £50 cashback.

In previous years, the offer’s been unlimited so cardholders could earn as much cashback per qualifying spend. But last year, Amex brought in a 10 time cap.

See the Shop Small map to find out which stores are participating in your local area. The statement credit should be applied within five days, but can take up to 90 days from the deal end date.

The offer excludes online purchases and buy now pay later transactions. Additional cardholders can also take part, but it excludes corporate, business travel, government and store cards.