Thanks for the replies guys!
So I have just done the checks you suggested toybreaker and the pedal pumps up very firm with car off and as soon as fired up it sinks away as it should do but it is very soft and with a bit of effort I can push it right to the floor
The pedal has been soft since I have owned it but only drove it a couple of times as I am trying to get it road certified which it has failed on due to brakes been crap!
I can see no sign of leaks from the master cylinder, abs unit, calipers or lines. So to me it points to either master cylinder issues or the abs unit playing up due to been not plugged in? I have a 2nd hand master cylinder lying around which I might give a try.
Air in the system will give a spoongy feel.
Had any part of the hydraulic system been opened, or components replaced before the problem appeared or did you buy the car in this condition?
 I see that you bled the system, are you sure you got all the air out?
Did you bleed the master?
Did you bleed the abs valve body?
I bled the calipers rear to front then bled the abs unit with no sign of any air bubbles after giving the pedal 10 pumps on each.