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I agree with you propole that it teaches you safe working practices, good techniques and tips, but when i went on the course I thought there was far too much "scientific" theory which you really didnt need to know which took up most of the day and the practical sessions were very short. and most of the people on the course with me that day were saying the same thing also. Another plus is that you get a nice certificate to show customers that you are qualified so you do look more professional.
I also want to cover my back with noy much sense you should know what Im talking about!