As an experienced Captain, its a great day out when I'm flying with a colleague who has say, a couple of 1000 hours, is motivated and experienced on type.
Flying with a 200 hour cadet is fine, but its for 90% of flights , my job all the more harder, more fatiguing and require a higher workload.
Introducing 700 cadets in a year to RYA will up the monitoring levels and ultimately, stress levels of their current captains. Good luck. Especially if ICAO language is only level 4 .