I have this official reply to suedee from Pilot Ground Training, as posted in their forum.
Suedee
You incorrectly assume despite previous assurances, that our instructors do not have the experience to teach Navigation, Planning or Flight Procedures. We can assure you that is not the case, as our instructors in these subjects have taught these for what you call ‘The Big Boys’.
The subjects you quote are interesting, you are of course aware that there are 14 subjects within the ATPL Theoretical Exams. You may well find that when studying the internals of an aircraft engine, electrics and aircraft systems, an instructor with aircraft engineering skills would better pass on their knowledge, not just their experiences. We understand the selection of a ground training school is of importance to you but we would suggest that what you hear from other schools regarding competitors is not perhaps the best way to form an opinion.
As you are probably aware for the issue of a commercial licence, there is a requisite number of flying hours required, which includes a 300Nm cross country flight, so why not fly down to one of our seminars, so you can accurately judge for yourself. We’ve even arranged that visitors to the seminars pay no landing fees if they uplift 50 Litres of fuel from Kemble.
We wish you good luck with whatever ground school you do select, you may wish to consider asking questions, not just of instructors abilities (all of whom must be approved by the CAA/JAA) but of things like, class sizes, instructional hours given (in the classroom), course profile, price, availability of accomodation and security of your payments.
It would be a pleasure to meet you if you can get down to us.
I would just like to add that there will be more details soon I am told. Also thanks to the other posters in this topic.