Point being there was a huge shift in the rules and they intentionally left it to 5 mins to midnight to address the issue.
G-RUKA was registered in December '18, so they've been thinking about it for a while. There was a spat with the CAA end of last year, as the CAA weren't happy about the ratio of UK registered a/c vs those leased in from other RYR AOC. Maybe this led to the change of plans.