SVeeedy Gonzales

RoSPA and IAM are very similar but disagree on a few points.

Within RoSPA and IAM you'll also find individuals who have their own opinions on speeding, overtaking, etc.

Ultimately it doesn't matter what you do, they'll all make you a better rider. It's junk to claim that one is better than the other, many people do both as they hone slightly different areas of skill better.

I did IAM for a year and picked up loads though packed it in before I got to test stage as it was too much time to give up.

Off road days are good too - very handy for getting used to feeling the bike slide around. Snow and wet manhole covers become just a bit risky and not the end of the world.