Those arriving must take test up to 72 hours before leaving country of departure But there is still confusion over which tests will be accepted om 4am this Friday Britons will need to present proof of a negative test result to carrier on boarding ** Are you a British tourist abroad, trying to work out what test you need? Please email: tips@dailymail.com ** Ministers faced fury today as travellers are left in limbo with the new rules on coronavirus tests before arriving in the UK still not published - less than 48 hours to go until the system comes into force. From 4am on Friday those arriving by boat, train or plane - including UK nationals - must have tested negative in the previous 72 hours.