So, what was the final solution? Replacement of the slave AND hose?

• Thanks for all the help, the clutch works great now.

Another reason to replace the hose as i suggested, the hoses fail internally and close up be sure that fluid flows through it before installing the slave cylinder.
Follow Doug's advice.

The picture from your December 18th post does not show a banjo fitting.  In addition to the new slave cylinder are you installing a new hose at this time?

I am more familiar with the pre-verto setup.  However, I suggest loosening (but not removing) the two bolts holding the slave cylinder down.  That should allow you to rock the slave into a position where you can better access it yet be able to apply a reasonable amount of torque.  Once the hose is tightened, re-tighten the slave mounting bolts.

If that doesn't work for you, how about completely removing the slave mounting bolts, then undo the other end of the hose from the car.  That will allow you to work at the bench installing the new hose on the slave.  Once that is done, refit the cylinder with hose to the car and tighten the top hose fitting.

The new slave cylinder got here. How am i supposed to get to the banjo bolt holding the hose in? Theres no room whatsoever to get even a box wrench in there.

Yes. They go bad along with rear wheel cylinders on Mini's all the time when they sit for a long period.
You can bleed it and you should get a pedal but it does need replacing. Be sure to crack the hose loose before you remove it as it is a pita when you try to after the fact.

Can’t really see... but , yes, it looks pretty manky to me.... new ones aren’t expensive.

Get a new one, fit it...  And if the existing one is not too far gone, put it on the shelf for a later rebuild...

Although, the one I use is at least 25 years old so put it somewhere that you won’t forget easilly

Cheers, Ian

Im pretty sure its wet. Ive just used my phone to record the slave cylinder while i press the clutch pedal down because no one else is here right now. I topped it off.

looks like the rubber boot is rotted.  Is it wet?  

You need to have someone else push the clutch while you watch the slave to see if it's moving. Make sure your helper is pushing on the clutch and not the brake pedal.  (it happens)

Did you top up the clutch master cylinder with brake fluid?  (dot 3)

Does this look like a bad slave cylinder?

I have bled brakes before. I guess ill try that.

Pull the rubber boot back on the slave cylinder, if it is wet with fluid you need a new slave cylinder and you may as well replace the hose at the same time while you have it apart.
There are two different types verto and non verto a picture would help determine what type you have.

EDIT:I just read the heading you should have a verto set up.

I think you need to bleed the air out of the clutch hydraulic system. You bleed that like you bleed brakes. Have you ever bleed brakes before? Google it, lots of good videos on YouTube also.

No fluid behind the clutch pedal. I cant really tell with the slave cylinder. Does the car need to be on the check if the clutch linkage moves? I pumped with the car off and the linkage still didn't move.

wipe your finger along the back side of the clutch pedal in the car.  If it's wet, your clutch master needs replacing or rebuilding. cheaper to replace unless you're a DYI guy.  If that's not wet. Top up the clutch master. start the engine and pump the clutch 2 or 3 times and try to put it in gear. If it goes in, you need to bleed the system. However that does not rule out replacing either the master or clutch slave.  Is there fluid at the slave cylinder push rod?  That would indicate replacing or rebuilding that part and then trying the system before springing for a new clutch master.

I checked the fluid. It was about half full so i added some. Still no movement in the linkage.
Yr

Check the fluid level in the clutch master cylinder - it uses brake fluid. Do not overfill. If it is very low, it leaked out somewhere - that needs to be fixed.
If the level is good, then you may need a new clutch master cylinder. 

Does this mean i need to add clutch fluid

I just took video of the clutch linkage and nothing happened when i pressed down the pedal. Thats good i guess since it means its not in the engine. It grinds as soon as i try to put it in gear.

Where was the car stored for the 3 months when it was not used?  Was it in a damp location?

If you start the car in neutral, can you select first gear at all or does it immediately grind?   

Have you worked with an assistant and had them look at and confirm the clutch release lever is moving when you push the pedal?