How do i contact sia by email? SIA Email. The SIA so not publish an email address but would prefer you to contact them via a contact form on their website. SIA Postal Address. The SIA Postal Address is: Security Industry Authority PO Box 74957 London E14 1UG United Kingdom. The Security Industry Authority (SIA)How long does it take for the sia to reply? The SIA does not advertise the above phone number on their website, preferring to direct you to a contact form and promising to reply to you within 10 days. Unfortunately many licence holders and new applicants have waited several months in some cases for a reply – and even then their initial problem wasn’t solved.What happened to sias call centre? The Security Industry Authority (SIA) in their infinite wisdom; decided to close their call centre in July 2016 leaving countless thousands of licence holders and applicants in limbo regarding their applications, renewals, general questions, queries and licensing problems.
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