Apologies if this has been addressed elsewhere - I have just booked flights with BA to Corfu for the beginning of June (due to cancellation of Easyjet flights today!) & have realised that I’m now landing 73 hours after my PCR test will be done.

How strict is the 72 hour rule? I’m flying on the Friday with an arrival time of 3.30pm (local) and have the test booked for the previous Tuesday at 1.10pm. Should I move the test or is the 72 hours actually 3 days?