I have been on 3 of the BWCA's courses and I would recommend them to ALL window cleaners.
Being certified is a good thing to put on your stationery etc. especially when quoting for commercial work.
The H&S is not just general health and safety, it is targeted at the issues us window cleaners face, from a window cleaners perspective.
In my opinion Davie, you wont be dissappointed. The hundred quid, will be money well spent.
I am not new to window cleaning, and I learned a great deal on these courses. The Water-fed pole course was especially good, lots of information I'd often wondered about. Andy was there too (poleman) he might give a bit of an overview too.
I would take your employees, it will help them to take their job more seriously, and be proud to be a window cleaner, which we all should be.
-Philip