I can understand paying a deposit to secure a place on a course, but paying for the whole lot up front is just giving them an interest free loan. A solvent organisation wouldn't need payments in advance to continue trading so these holding accounts shouldn't worry those who have been able to survive the costs of JAR etc. But why have a holding account? Give them your money in installments, in the meantime see if you can earn a bit of interest on it yourself.
If I was doing my training now I would consider seriously picking only organisations who don't insist on one up-front payment. When I did do my training ten odd years ago I never paid a penny up front, that was the norm then, so it can be done. And yes all my training was done in Bournemouth with organisations that are mentioned on this thread, and recently demised.