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Bubbles isn't a sign of a good shampoo chap, just FYI. It's more about how slick it feels on the paint.
Having said that AG shampoo is shocking. If you need a halfords buy get Megs gold class or order something like born to be mild/lather/Gwash online.
Just to clear up some incorrect assumptions in this thread...
If it's bake on brake dust, it is Iron contamination. Therefore, you need an Iron remover (IronX, WWHW, IronOut etc). If it is staining from another contaminant, you need a remover for that, so TarX/Tardis for tar, clay for other...
The aim of thicker foam is less water so lighter foam, this ensuring it clings for longer. You're right that it's the bottom of the foam that acts, so the longer the cleaning agents cling, the better they clean. It's not just for looks.
And it's not the pressure that shifts it, although I...