Demolition of problematic parts accomplished today. It's not as much fun removing stuff as installing it - especially the exhaust with all the slip fit joints.
The exhaust is going back to the ceramic plater to be re-done. The expansion tank is going to the radiator shop to see if the pinhole leak in the tank seam can be fixed. If not I'll be in the market for a new one this time. I'll re-seal the girling brake fluid can myself.
Maybe I'll be back in forward motion in a month or so.