Worked for Me!
As a Nav of 20 years RAF experience I went to BGS on the multiple recommendations of wannabee colleagues. They were right. I have had many instructors and teach a few aviation subjects myself- I couldn't fault the attittude or technique of any instructor there. I found answers to all questions (except the 'why the f*** do we need to know this'? type) well presented and thoroughly explained.
Alex and his team are as good as I have seen.
Trotts