Where is the engine code on the engine on an Astra Mk4 1.8sri 51 plate?

On an Astra Mk4 1.8 SRi (51 plate), the engine code is typically located on a flat surface of the engine block. You can find it on the front of the engine, near the timing belt cover or on the driver's side, often stamped into the metal. It may also be visible on a label attached to the engine itself. For a precise location, consult the vehicle's manual or a service guide.