The new £1 coin will be rejected by some machines in the London Overground network.

The new 12-sided coin, which is launched on Tuesday (March 28), will not work on all machines at London Overground stations whilst machines are updated.

Although the change has led to amendments for some time, not all commuters will find themselves with machines allowing the new coins to be used.

Chief Technology Officer at TfL, Shashi Verma, said: "We have been working since last year to upgrade our machines and all stations on the London Underground, Docklands Light Railway, London Overground and TfL Rail network will accept the new £1 coin once it is launched."

The coin was designed by David Pearce, a schoolboy from Walsall who was 15-years-old when his design was chosen out of thousands.

The old pound coin has not been replaced for more than 30 years, but due to its vulnerability to counterfeiting, a new coin has been designed.

The coin's anti-counterfeiting features include a distinctive 12-sided shape and dual-metal design, with a gold-coloured outer ring and a silver-looking centre.

It also boasts a hologram-like image that looks like a "£" symbol or a "1" when viewed from different angles.

Behind the scenes: How coins are made at the Royal Mint

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Chief secretary to the Treasury, David Gauke, said: "This is a historic moment as it's the first time we've introduced a new £1 coin since 1983, and this one will be harder to counterfeit than ever before.

"Our message is clear: if you have a round one pound coin sitting at home or in your wallet, you need to spend it or return it to your bank before October 15."

Visit the Royal Mint website for more details about the new £1 coin.

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