Got the spares from ICP in the end. Excellent service and had everything in stock I needed.
Fixed the broken spring retainer in the RH ergo lever (apparently a common fault according to campy only). Sadly this wasn't the problem. It's a roundabout story but I ended up converting the lever to 9 speed in order for it to shift index a shimano 8 speed block with a mavic rear mech
Good instructions for doing similar can be found here > http://www.yellowjersey.org/ergo1.html
here > http://www.nuttycyclist.co.uk/cycling/ergo-rebuild.htm
and of course there are the schematics on campagnolo.com