MegaExo bottom brackets

[busdennis]

am i right in thinking that i can fit any FSA crankset to my bike which as a british BB if i buy a MegaExo bottom bracket?

 

[busdennis]

if its got a 24mm spindal its compatable?

 

[busdennis]

mega confused now
after a bit of research bb30 uses a 30mm spindal?

so how does this work?
http://www.ebay.co.uk/itm/FSA-Visio...rey-BB30-/301169621403?_trksid=p2054897.l4275