TD4 clutch issues

Hi all new to the forums but have had my 02 Freelander for about 7 years and found it great fun until now. Last year we replaced the clutch and cylinders with nice shiny new LUK ones and have done around 1500 miles due to the wife being ill and not being at work but yesterday when I took it out I noticed the clutch slipping, I was wondering has anyone had issues similar or any ideas as I would have thought a clutch would last longer than 1500 miles. Myself and my mechanic was wondering if it could be the master cylinder holding pressure but the peddle seems to be fine. Any ideas will be great Many Thanks in advance Terry

The master cylinder has to reach its full returned stop (extended) or it could possibly hold the slave hard against the clutch release fingers.
It could also be air in the system or less likely, a faulty slave cylinder.

Cheers I'll try bleeding the system from the bleed valve and see how it goes fingers crossed it cures it and we don't need to drop the box out

As Nodge says - you must check for full travel and return (especially return!) on the clutch operating arm. If, however you cannot find anything actually wrong with the mechanism suspect either a faulty clutch (not unknown !) - or - bad oil contamination from a leaking rear engine crankshaft seal (could also be gearbox input shaft leak but less likely)
Best of luck.,
Joe