At last i have rebuilt it. I eventually got it out by soaking it in hot soapy water for 20 minutes, it still hadn't moved so i poured almost boiling water down the hole. bang i got a master cylinder and some boiling water on my face, but i was happy it was out. I sujest using safty goggles or being very careful if anyone else tries this! once it was out i tried to put it back in but it was very stiff, I refured to some verniers and the inside diameter was 13.99mm and the external diameter was 14.02mm basically it would not push in. I lubed it up with some vasaline and pushed it home with a pillar drill but it only had travel in the bottom of its bore. After some more soakes (now with the lever in place to avoid expolsions) with boiling water and warm rinces it popped back out, now it works. I never realised how many little bits there were in my lever until just. I've loctited the lever bolt in place so it doesn't have to be done up so tight as to clamp the lever It's not perfect, so i'm not going to re-fit it now, I'll leave it until tomorrow evening or later to make sure it's not going to re-seize, then I have to re-bleed the system again. Trauma over, thanks people for your help and I hope this can be a reference for the rest of you. I couldn't find any other information online.