AA Zone

Hi all i'm driving a volvo 440 (1991 H reg), and the clutch is starting to slip. The clutch is not slipping all the time just when going up hills and with acceleration from say 30mph when in 4th gear. I have adjusted it as far as i can (going by the pedal) as it was quite high.

I want to know if anyone can give me advice on what part(s) i would need for a repair, as this is an old car so i dont reallly want to buy a 'new' part if this can be avoided.

I know a few reliable volvo breakers who would be able to supply the parts, but again what part? (whole clutch system, discs, plates, flange?(the springy bit))

Any advice would be helpful, Thanks