No worries. I'm sure a few UK guys will be along to answer that, you
have been very helpfull with the rest.

I could entrust it to any indie mechanic, I realise that, but with it
being such a large long job on the V8, I don't want them to skimp on
attention to detail.

It is an old one that has apparently been here some time and was an
embassy car, but I have no history to prove that.

My question is, will a UK LS400/Celsior be running on Mineral, semi, or
full synthetic and what grade for all year round driving.
********
The car could be running any of the oil types you mentioned, depending on
what the previous owner used.

The car is a 1990/91/92 according to the J plate registration number.

Am I looking at any mad convoluted process to do an oil and filter
change service, and do things like sump washers need replacing after oil
change?

************
No, you may have to drop the splash shield under the engine if it is
equipped with one.  Sump washers do not need replacing after every oil
change.

The car has done 177k kilometers, so I guess, sans history of any kind I
should prepare for a belt change sooner rather than later.
Any idea who is an independant in the northwest of england who can do
that and what sort of price it will cost me?
Cheers.

It is an old one that has apparently been here some time and was an
embassy car, but I have no history to prove that.

My question is, will a UK LS400/Celsior be running on Mineral, semi, or
full synthetic and what grade for all year round driving.

The car is a 1990/91/92 according to the J plate registration number.

Am I looking at any mad convoluted process to do an oil and filter
change service, and do things like sump washers need replacing after oil
change?

The car has done 177k kilometers, so I guess, sans history of any kind I
should prepare for a belt change sooner rather than later.
Any idea who is an independant in the northwest of england who can do
that and what sort of price it will cost me?
Cheers.