JohnnyC, many thanks.
That would explain it.
But let's see what the others might say.
The car was serviced under the TLC arrangement.
I know that should not make any difference -h-ha!
I only saw "oil change, oil filter and micro filter" on the paperwork/leaflet/service book page.
We had our Lexus serviced in April.
Two years old, second service (none of this two year/20k mile rubbish
They changed the brake fluid.
That's really why I was querying it.