I did the 4 week one in York, you are quite right about practical experience, very limited and so many variants you won't have encountered before. I have to be careful when I choose what to take on. Each extra qualification is another week off work and ££££ to get 'qualified' 1 day equal to 2-3 hours max on unvented, take the closed book test ans very very basic fault finding and I'm supposedly qualified to install and service them, no way would I without further experience, somehow.
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