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Well I bled it all out the other day, 30 miles later and it's back to not working.

Hey ho, time to start swapping components.

I noticed lots of bubbles in the master cylinder so guess that will be first on the list unless u guys think something different?

Master cylinder service Kit required. I did my front brake one and the difference was astounding. Assume the clutch is a similar set up.

It could be air trapped right at the lever banjo, the best way i have found for getting this out is to take top off master cylinder top up full losen banjo a touch being carefull not to go to far you need a very slow drip leave for half hour taking care not to get fluid on anything top up as nessacerry don't let it get to low, nip up banjo then just tickle the lever this should get any small bubbles out of the banjo back to the cylinder when the bubbles stop in the cylinder replace cap check for clutch if still no clutch go to the other end remove the grubscrew pump the lever about a dozen times hold lever in market stall clip works for this then press down the ball bearing i use an allen key for this job you should see air comming out repeate untill no more air exits and you should be good to go.
If this dosent sort it you will need to look deeper
Hope this helps Dai

If the fluid in the reservoir is discoloured, it could mean the slave cylinder seals have failed and gearbox oil has contaminated the system. If so, new slave cylinder, fresh Dot4 and fresh gearbox oil.