You need as much as possible really - alternator, PAS pump and pipes (Disco hi pressure pipe will reach, but doesn't sit flush to the cross member. TD oil cooler pipes and adaptors (long enough to reach the rad)
Service kit (oil/oil filter/fuel filter), some 8mm fuel hose and jubilee clips, assorted bolts, washers and nuts. New front and rear crank seals (adaptor plate on block needs to come off, along with the flywheel (which are the same 200tdi & n/a) and the front timing cover seal. Defender temp sender, oil pressure switch, (may as well put a new one on). Other than that, just usual consumables, WD40, gaffa tape, selection of hammers, electrical terminals etc...