Multi skilling as in dual trade? Well that had been proved already in service, so it wasn't a leap of faith to go the whole hog.
I often thought single trades were a waste, after all there was so much overlap in certain areas that the training part could have be reduced in combining the trades, I found it quite straight forward when I came out to "add" the missing parts to my knowledge base to go multi trade, as they did indeed overlap. Single trades in the RAF could be a hinderance to those coming out and into the civil side of things, I think I was lucky as my experience covered helicopters, fighters and airliners which gave me a broader spread, indeed the VC10 courses as a "Sootie" meant I would do runs for all trades so the courses rightly had to cover systems etc for those other trades.