Are you craving a mid-week burger fix? Money-saving expert has revealed a free burger deal-but it's valid only on Wednesday. The deal allows customers to claim a free Whopper from Burger King, including the popular plant-based Whopper.

Martin Lewis took to and to let people know about the deal and wrote: "Totally free Whopper or plant-based Whopper at Burger King tomorrow..." On Wednesday, March 5, Burger King will be offering its Whopper completely free of charge when ordered through the app.

The deal is available until 8:00PM or while stocks last.

To claim the offer, simply download the Burger King app, sign in to your account, and head to the 'Offers' tab.

From there, tap 'Add to mobile order' or 'Redeem in restaurant' and choose either the original Whopper or the plant-based Whopper.

This free Whopper offer is available to both new and existing app users, with no minimum spend required except if you're ordering through UberEats, where a minimum spend of £20 applies.

The deal does not include sides or drinks, which will need to be purchased separately and the offer is limited to one free Whopper per app account.

The offer is available at all Burger King restaurants across the UK, with a few exceptions which excludes restaurants located at motorway services, airports, and holiday parks.

Depending on which Burger King you usually go to, the Whopper is normally priced between £6.29 and £7.49.

Be sure to check the app for more details on the exact locations participating in the promotion.