More wasted hours and a bit of petcock broken off in the tank!
I managed to pull more of the petcock and the brass tube out, maybe 2" but there was definitely something preventing the head from coming out.
There was a plastic sleeve which came out but it was almost as though it had broken in two with one half still on the tube but inside the tank and this was holding it back. I pulled, levered tried to break up this plastic tube although I have to admit the bit inside seem like hard fibre.
Eventually the inevitable the brass tube broke leaving the sleeve and top of the brass tube stuck in the outlet. All I could do was tap these back into the tank. Not the end of the world because it will sink to the bottom of the tank but annoying.
Now there must be some washers missing because when I screw it all back together the outlet from the petcock is pointing skywards.
Call it a day for today, yet again..........