He must have been dismayed last week when Portugal flip-flopped over whether to let us in  and only relented on Friday. We may have left the EU but EU countries seem keen to stay in touch. He need not have worried. His face covering couldn't hide his smile. Thirdly, you must take a PCR kit with you or take a test in Portugal within 72 hours of your return to the UK  it has to be negative.
Only relented on the fourth day of the week.
( z0 relent :mod ( z1 only ) :time ( z2 day :ord ( z3 ordinal-entity :value 4 ) :part-of ( z4 week ) ) )
(z0 / relent-01
    :mod (z1 / only)
    :time (z2 / day
              :ord (z3 / ordinal-entity
                       :value 4)
              :part-of (z4 / week)))
Only relented on the fourth day of the week .
z0 :mod z1
z3 :value 0
z2 :ord z3
z0 :time z2
z2 :part-of z4