I was out stuck in traffic yesterday in my 74 leyland S when my clutch started engaging lower and lower on the pedal and it became increasingly difficult to get into first while stationary and idling.
By the time I got home pushing the clutch pedal in at idle was causing a loose rattling sound from the engine bay and a slight drop in idle revs. The clutch take up seems normal and there was no slipping or any other issues.

The car has only done about 10,000kms since the clutch was rebuilt.

Does anyone have any idea what could be going on here? I just spent money last month n new wheel cylinders and really don't want to spend any more right now...

How much is a new clutch rebuild if required?

Sounds more like your clutch master or slave cylinders are leaking.
Check the fluid level & look for leaks. Note that the master cylinder can leak down inside the car so can be hard to spot.

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Too many cars, and too little time.

check clearance on the screw thinghie on the wok (someone will know the correct terminoligy )ben at link adjusted mine last week as my gearchange was crook

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65 panel van Sprog
73 panel van Iggy

Could be the bearing?

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1969 Cooper "S"
1967 Mini Deluxe
1973 Clubman Van (the fleet spare)
1978 ex 1275 LS ("Wizard" Eaton Supercharged)
2015 HSV GenF GTS(occasional drive & tow car)
2019 MINI F55 Cooper S

sounds like a thrust bearing to me too - PM me if you want a replacement that will last

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did I tell you that I won a trophy?