Can you spur a double socket from a PIR light with 2.5 cable?

Yes, you can spur a double socket from a PIR light using 2.5mm² cable, provided that the circuit is rated to handle the additional load. However, ensure that the total load on the circuit does not exceed the rating of the PIR light and the circuit breaker. It's also essential to comply with local electrical regulations and standards, and consider consulting a qualified electrician for safety.