Most of our offers are available in any UK store (Tesco, Sainsbury's, Waitrose etc), including those that aren't shown on the map on the product page.
So you can do you shopping where you want, in your usual supermarket but it also works with click & collect or home delivery.
Some offers are specific to one or several retailers (for instance only at Tesco) but it will be written on the offer page and you can always refer to the offer Terms and Conditions to make sure your cashback request is eligible.
The retailer need to be able to provide a receipt with the required information such as the store name, the list of articles with prices, the total amount, the date and time of your order.
Receipts from small businesses may not be accepted because they are often subject to fraud.