First of all, thank you for all of the replies.
I managed to nip to the workshop today and have a bit of a nose about. I couldn't get the caliper off of the disc without releasing the bleed nipple a little to release some pressure which does point toward the master cylinder I think. With the Caliper off, pumping the lever did push the caliper pistons out but they retracted back to their original position, where as in my experience it is possible to pump them out. ??
The Brake lever doesn't appear to be adjustable.
The brake fluid does look a bit grungy so I think stripping and cleaning the lot might help. The front Brake has always been a bit ... wooden, feeling wise since the swap to braided lines but has never been a problem.
I have another couple of sets of discs in the workshop so i think i'll swap that one out to ensure its not warped after being so hot and i have a few new sets of pads somewhere too.
DOT 4 Fluid right?
As a side, or additional question, the brakes discs have, very slightly, different distances to the fork leg, the right side is closer by a couple of mm probably, I can see it without needing to measure it. So, I loosened all of the axel-related fasteners and the Tardozzi Fork Brace and AND the fork caps and let the fork fully compress - which I thought would "even" everything out but made no difference. As its a MONZA, there is a Spacer on the left side and the speedo drive on the right, should there be any other bits in there? It looks like a thin washer on the speedo drive side would even it out again, and i seem to remember there being one but am not really sure.
I find it hard to imagine that something got that bent when the bike fell over as it was effectively pushed forward off of the side stand, fell to left and landed on the Crash bar and bar end mirror. The Exhaust was untouched.