If this case encourages The Revenue to start snouting about, the only people to suffer will be:
1. Wannabee airliner drivers masquerading as FIs.
2. Potential students.
PPL schools will merely offer the opportunity for PPL (and/or 'fATPL')-holding FIs to do some instructing. NO PAY - just refund of petrol money and perhaps the cost of lunch.
No real issue for the PPL school - but not much fun for the kid trying to use flight instruction as a way to pay off the cost of his/her fATPL or to 'build hours' for that all-important (and utterly dull) 737 co-pilot job.
As ye sow........