They were selling Pro trinkets at £7 a pop...but got reluctant to supply when I ordered all ten that they had.
Why not the Pro Mini? Probably because I don't know what I'm doing...I started with a trinket and I'm "used" to it now (by my humble standards).
Found a local guy in the end who ordered me a bunch of them direct and didn't hammer me for his profit. Anyone local to Yorkshire should consider calling Mallinsons Electronics...good bloke, won't mess you around.
No official line on why some Amazon sellers are trying to gouge people for £30 though...