Thank you for all the replies and well wishes folks
I’ve spoken to the the owner and have found out some more information on the van.
Main dealer and independent service history present.
Auto gearbox replaced
Roof control display replaced
Roof canvas replaced
Sliding door replaced due to a minor accident
Camping table has a burn mark
I asked about exhaust fumes through the cab air vents due to the problematic manifold. According to the owner there are none.
I will be travelling from Ireland to the UK to collect it early next week.