Vending machine: How to update for new £1 coins?

Vending machine: How to update for new £1 coins? I'm currently transferring to a new role which includes managing a vending machine. In the UK we adopted a new £1 coin a few years ago but no one ever updated our vending machine to accept them.
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bert [Entry]

"@jakeagoldsmith just looked through the old field engineers manual for the 690 mechanism. It appears that if you disable the £1 coin, it will not matter if it is old or new. It just won't take it. Try to enable it and see if you can now use the old and the new coin. It looks like the mechanism will not be able to distinguish between old and new. So, the smartest way is to disable all of them so you do not get stuck with a bunch of old £1 coins.

I do not know how similar in size and composition the old and new coins are but I would think that eventually Mars will have to redesign and upgrade the mechanism"