CZ, unlikely that Metoffice was there during operating hours as Saturday and Sunday flights only operate during term time and the kids are still on Easter Holidays.
Also Coll and Colonsay are only licenced during the short windows when the scheduled flight comes. And according to the website entries for Coll and Colonsay "landings are only permitted outwith the times of the scheduled air services".
Therefore it would seem that for whatever reason they are not as yet enforcing the permits which is good news for now at least.
Metoffice - were you one of the several aircraft routing from Colonsay to Fife on Saturday. We were coming south from Plockton and heard them on Scottish Info.