It's ok it took ages but I have got the other pistons out. I had cleaned and put the one calliper back together then attached them both back to the lines and pumped the fluid though then pumped the pistons out with the lever.
Although I have managed to loose two of the most expensive washers in the world
and I need more brake fluid but all is now going t plan. Although the left calliper was much dirtier than the right for some reason.