Thanks everyone for the help - looks like I have it back on the road again. I think I have been able to bypass the normal bleeding procedure as it was the line to the Brake Press Modulator Valve which has a return directly to the master cylinder. Pumping the pedal repeatedly appears to have restored full pedal feel. I cracked the lines on all but one of the wheels and have clear running fluid with no air. I plan to keep an eye on it and bleed as necessary if there is any change in the pedal feel.