Dr Hilary Jones had stern advice for those believing that Heathrow airport's coronavirus testing centre could "replace quarantine".
With the new testing facility inside the Terminal 2 building allowing travellers entering the UK to be tested for Covid-19 on arrival, there's hopes it could reduce the amount of time holidaymakers need to quarantine.
But Dr Hilary was quick to encourage holidaymakers to "be realistic" before thinking the test is a game-changer. Speaking on Good Morning Britain on Friday, he warned why the test might not reduce the 14-day quarantine period, and told people not to be reliant on it.
He told GMB hosts Kate Garraway and Alex Beresford that it might not even mean a lesser self-isolation period, while warning that