Software tiddler Catenae Innovation more than doubled in value after it started talks with potential customers for its coronavirus digital passport.

The company's app – called 'Cov-ID' – records a user's Covid test status, which could allow people to go back to work or meet friends.

After racing through development over the last few months, it is now in discussions for potential UK and international deals. Its stock surged 117 per cent, or 3.1p, to 5.75p.

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