Postscript to the above for anyone doing this job, incl you Janner, heres what I found out in my adventures in brakeland;
Dont use non OEM seals, even the mid priced ones like I tried, they dont even go in properly so forget them working for any length of time, the Yam ones went in a treat, cost £25 as oopsed to £7, but seven quid wasted.
I used a syringe to refill the system, fill the resevoir to min level then pump it in via the bleed nipples, when you stop getting bubbles in the res', start sucking out with the syringe on the nipples instead constantly topping the res' up,,dont let it run out !!!, [ cheers Gnasher for the tip about doing the inner nipple first ] .dont crack the nipples open too far, Ive a theory that they suck air in along their threads. When the rate of bubbles starts to slow give the caliper a tap to dislodge any air pockets, not as daft as it sounds, I got a bit more air out like this, then when your pedal is getting firmer but youre still getting air out, probably mainly from the threads or around the bleed hose/nipple surface, not genuinly from the system, stop using the syringe to suck, with the syringe and hose still attached just push the pedal down, slacken the nipple -tighten the nipple-let go of the pedal several times til by this point the system should be bled and no more bubbles. Oh happy happy happy feeling playmates !
Lastly, adjust the pedal position properly, doesnt affect the length of travel, I know, but when its positioned right it feels like theres less travel.
And that, boys and girls is my experience of resealing the mediocre back brake. I got mine finished tonight and it feels tons better, lets hope it stays that way. I hope that this helps anyone who like me isnt an expert.Thanks to all on the forum as ever who've chipped in with suggestions, Im pleased with how its turned out and enjoyed doing it, well, most of the time..