The whole way the CAA operates with FTOs and RFs is a joke. To teach someone their PPL from scratch, and instill important lessons to them, you need only to be a RF (ie operate out of a campervan in the corner of an airfield).
Yet for a 5 hour type rating you need to be a TRTO with all the associated training manuals, post holders, nominated aircraft etc. Go figure that one out.
I really despair the way the UK flight training industry has gone, no-one wants to instruct as the pay and terms/conditions are terrible (still £45 per hour for the last ten years).
It's viewed as a "stepping stone" job to build hours, you are stuck doing trial lessons for years, pushing aircraft around, acting as unpaid ground handler/refueller/cleaner, exploited by the company
Maybe if you're lucky you might get a sniff of charter work (after paying for your own turbine rating of course). Often the best instructors are the ones doing it for fun/part-time (with another income), they haven't got the extra pressure of trying to earn a living/pay debts off.