Astra Airbag Warning Lamp

Yes, I have seen similar issues with Vauxhalls of that era. The restraint system wiring can be quite sensitive. Have you tried checking the connections under the seats? Sometimes they become loose.

Under the seats? Are there any specific connectors I should be looking for, or anything that indicates an issue, like corrosion?

Check for orange or yellow connectors - those are usually related to the airbag system. Look for any signs of damage or corrosion. However, it's wise to have it checked in a workshop, as the airbags are safety-relevant.

Thanks. I took it to the shop. Indeed, the cable connection was defective as I suspected. Cost me 95€ to repair. Appreciate the input!