yeah they are not remote but there are plenty of cases of this being done on all rover v8s so unless like you say its an acces issue then it must be doable and can save a lot of dismantling.
here we are , an excerpt from anothe conversation:
Also pressure relief plunger gets scored.
un screw blanking cap and remove spring and check plunger (scoring is sure sign of cooked oil)
(tadpole replacement available)
put Vaseline in grease gun or cake icing tool.
Disconnect king lead
squirt Vaseline at back of plunger hole,flick starter repeat (do 4 times)
refit relief valve assembly and king lead
Start and oil light should go straight out -if it doesn't repeat previous procedure as pump won't prime.