If other CAA's can do it in 7 days timeframe I suppose every CAA can do it as well.
the UK CAA don’t do anything in 7 days in my experience, I have had the misfortune to have asked for a licence verification letter many times and it always takes a month.
i believe the UK CAA are saying 19 working days to turn around the Doc 155 and send it to the IAA (or wherever)
however the IAA seem to be making the initial request more or less immediately which is nice.