I would have thought the best place to train in Beauty Therapy in Glasgow would be at any of the Colleges. The best Beauty therapists I know have their HND in Beauty therapy. I know this is a full time course, therefore I am not sure if it is suitable for you, but if you are serious about making aliving as a beauty therapist then you should look into it. Good Colleges are :
Central College, Glasgow
James Watt College , Greenock
Clydebank College, Clydebank.
Without knowing what part of Glasgow/Scotland you are from it ids difficult to give more.
I am sure some girls on here have trained with the fast track courses you have mentioned, but I think they are still only working mobile for themselves doing the treatments they trained in, to be employed by a salon you would require at the very least NVQ qualifications, and preferably an HND.
HTH