I've owned so many 190s I can't remember them all & I've found the best ones to have been the one's used quite hard. If they're serviced, have good coolant & oil, not allowed to get hot & warmed up first you can drive the ****** off them with no ill effects. They thrive on it.
It's the low mileage, pampered, never driven above 4,000 rpm ones that have problems. It may sound odd, but I'd rather have a properly serviced & regularly used one with 134,000 than this seized & dry specimen with an alleged 34,000 & years of inactivity.
In his Questions
"Q: Hi, What date was the last service? Ta.
A: Around 9 years ago,but the cars hardly been used since."
9 or 15 years - doesn't make any difference, it's too long by a factor of nearly a decade at least.
It doesn't look like a 34K car & doesn't have the look of a cherished low mileage car. Buying big problems with this one I'd say.