I did a City and Guilds level 2 one day a week over 2 years.
Personally, I feel that I learned so much more when I was in full time employment as a Florist. College is good for teaching you some of the basics, but they dont teach you enough about the everyday things you have to do as a florist.
For example, we never ever learned how to simply wrap cut flowers!! This is one thing that work experience girls at my shop seriously struggle with and its the one thing that I feel they should be able to do easily.
One moment that really sticks out for me was when in my first job after college I was asked to quickly make an 'FFC'. I had no idea what this was until my boss said it was like a tied sheaf. I started to make it how I'd learned at college and realised that this just does not work in the real world- the customer doesn't want to wait forever. College doesn't teach you speed, of course that comes with practise, but I don't feel they prepare students enough for the real floristry trade.
Thats just my opinion!!