Interesting! As someone currently completing the APS course at NATS (following having done Basic and ADI) I would urge massive caution at the idea that you will have 8-10hours per week free for consultancy. I totally empathise with your situation thought.
To give you an idea, during the 9 week basic course we had a written exam every 4/5 working days... the first being Air Law at the end of week 1 (10 written exams, 5 practical exams and an oral board). Everybody on my course spent at least 2/3 hours a night working, having done 0830-1630 at the college, in addition to at least a day working at the weekend. The workload is, quite simply, relentless... but then that is what the public should expect in such a role.
It is a great feeling though when you pass the courses!
Good luck!