Any question answered...

I'm around 6'2" and have just bought a 57" Bianchi road bike. Will it be too small? I don't mind it being a bit more of an aggressive riding position as long as' its not far too small.

I'd say yes.
57cm to top or on centre?
Top tube length is more important really IMO and the length you need depends on your torso not height.
I'm 6'2" and I ride a 58/59 on centre with a 57 top tube and a 120 stem- but that's me.