Nuts securing the big end bolts are spline on a 200TDi. You ever tried to get hold of a suitable (female) spline socket in Eastbourne on a Friday afternoon?
Not a pleasant experience, let me tell you...tracked down a set of those multi-fit sockets eventually about 10 miles out of town for the not inconsiderable sum of £35.
Every car except my fondly remembered Rover 827, which was a marvel of common sense engineering courtesy Mr Honda, has had at least one "funny" tool required...the Disco is no exception!
The 827 was a bl@@dy big lump in a not bl@@dy big engine bay though...changing the cambelt was an interesting way of getting back ache!!!
Malcolm