thanks all for the comments/insights.
@Alsace_rangie very much seems a non-standard problem (when isn't it? ha) using CalVIN, the spec breaks down as follows:
Model: Range Rover Classic (1989-1996)
2-door: Pickup, hood cab, truck cab, or soft/hard top
Engine: 2.5 litre Tdi diesel, model 11L (200Tdi) or model 16L (300Tdi)
Transmission: Left-hand drive (LHD), 5-speed manual (LT85, LT77, LT77S, R380 or other)
@elbekko yes, for sure an R380; reverse under 5th. @Nonimouse definitely 200tdi.
I've just had the parts arrive from Land Rover today, will post an update on outcome.