0300 123 9298 Last checked 31/12/2025 PLEASE DO NOT CALL US (WESTMINSTER SECURITY) REGARDING SIA RELATED PROBLEMS OR QUESTIONS, CALL THE SIA ON THE ABOVE NUMBER DURING THE APPROPRIATE TIMES – EXPECT TO BE ON HOLD FOR ABOUT AN HOUR! SIA Email If you have an SIA online account, log in to your account and use … Continue reading SIA Security Industry Authority Contact Number