So I fitted my rotors and calipers yesterday. After some sponginess and unhappiness on my part on the drive home from my uncles I revisited him today for another bleed session. Found that a leaking line was the cause of some of my unhappiness.. Swapped the lines over from my old calipers and wallah - we are slightly better..
Still a little unhappy with how spongy they are, completely flushed the old fluid out today and replaced with new stuff.. And I'm sure there can't be anymore air in the lines. Anyone have any other ideas?