What kind of engine is this?

[Crisfole]

Trying to figure out exactly what engine is inside this bus. Anyone know how to read British engine codes? My GoogleFu is failing me badly. I know it's a Cummins with a ZF transmission.

 

[SolomonEagle]

Take a picture of the engine

 

[peteg59]

Perkins is a big supplier/manufacturer of diesel engines in the UK.
As said, pics will help...

 

[Crisfole]

These are the pre-inspection photos. School Bus Conversion Resources - Crisfole's Album: Double Deck Inspection Photos

Although, having looked it up, it sounds like Leyland Olympians were only ever made with L10 Cummins engines.

Anything to watch out for? Is this good news? Bad news? No news at all?