@UtopiaExpert: Maybe you are right, I haven't been doing this for very long since my last break and never lead before. But to me it seems like group 3 is really a myth, they are either part of group 2 or 4 but I suppose my experience ATM has a short sample size.
In terms of GBP, I guess on Trad Marchs it works well. It doesn't work well on learns.. it basically doesn't fire at all frankly.