Just something off topic.
Anyone know the part no for that plastic tube shown with the filter?
When I changed ATF oil recently, mine got cracked, (a hairline only). Tried to locate one but no luck.
They sell only the filter.
That tube is specific to range Rover so it's main dealers or used. Running with a crack may affect suction on the oil. You could try ashcrofts.
The ops box sounds as if it's ruined by a lack of oil changes but 200000 is good going. Lesson learnt also Keep changing the oil even if you don't do the filter.
£300 sounds fine btw.