I'd be amazed if it's not on the original clutch,nothing to worry about though as they go for years and years,my 328i started slipping at 189000 and it had been given a bit shit over the years!!!
Looks really smart that,hope it sells soon for you fella,can't really think of a better person to buy a car off,someone who deals with engine tuning on a daily basis AND an ex mot tester!!!