Here is a different approach, which uses the actual McDonalds app and gives you food.
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Contact Customer Service: Email McDonald's customer service in the UK.
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Place an Order: Order a plain burger (or other food) via the app, ensuring it's through the rewards system.
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Report an Issue: Claim the order was made incorrectly because it wasn’t plain, saying an allergy or something to one of the condiments as the reason.
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Modify the Receipt: Use inspect element or Photoshop to edit a receipt that is sent to the email when you order through the app, so that you can do it multiple times instead of using reward points every time.
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Send Proof: Provide the altered receipt when customer service requests it.
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Match Details: Ensure the location on the receipt matches the location of the location you ordered from (along with the food).
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Receive Food: You will probably be offered two free medium meals, which you accept.
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Rotate Locations: Keep changing order location.
This only works for UK McDonalds (I believe) which is the in-app rewards method.
(dont request for it, they will give it for free)