Hi
I'm also experiencing a very similar clutch problem.
First, let me tell you about my clutch issue. I've got a 2007 Freelander 2 2.2 Td4 SE with 260k Km on it.
I had a slave cylinder issue about 20k Km (2 years) ago, when the clutch pedal went to the floor and when I pulled it back it just went straight down to the floor. I looked under the engine and saw the brake fluid pouring out between the gearbox bell housing and the engine. I then looked at the service manual and found that the slave cylinder is combined in the thrust bearing. This immediately showed me that it was going to be a big job dropping the gearbox. So, I did the responsible thing and changed the dual mass flywheel, clutch plate, pressure plate and the thrust bearing, which is also the slave cylinder, all at the same time. This was a solve for the first clutch problem.
Now, I'm experiencing more or less the same issue. About a month back the clutch pedal started going soft and after a few days also went to the floor and as I pull it back up, it would just go down again. First this I thought is the slave again and looked under the engine for leaks. No leaks and the brake fluid level did not drop. Then it could not be the slave cylinder again as it is only replaced about 2 years ago.
So, I then replaced the master cylinder, which was another big job that I did not expect. Bleeded the entire clutch system after replacing the master cylinder and the clutch was working fairly good, but still some air in the system. I drove with it couple of days and kept bleeding the system and it just kept being a bit soft, thinking there must still be air in the system. So, a week ago I bleed the clutch system with the bottle method with a bit of brake fluid in and a pipe inside and connected to the bleeding nipple. I did this untill I saw all the air coming out of the system and only clean brake fluid coming out the pipe.
The clutch was perfect. I was so happy that the issue was solved. Yeah right, only for 200 Km, then it started going soft again. It happened gradually. When I drive in town it's perfect, but when I drive on the freeway over 30 km then the pedal goes soft and stay on the floor. Then I pull it back up, pump it a few times and it's fine again, until I drive on the freeway again, then the clutch goes soft again. I can't see any leaks anywhere. I can't think that the slave is busy going again just after around 20k Km. Can it be? I'm not looking forward to dropping the gearbox again. It's not an easy job and to pay the agents an arm and a leg just to replace the slave is rediculous.
My only thought is to drop the gearbox and replace the slave again as I can't see any other solution. Is there a way of seeing if it is the slave that maybe has a small leak without dropping the gearbox?