The SIA is about to roll out a new update for their website that will streamline the process of both applying for a new license and renewing your existing one.
While they update their systems they will NOT be accepting applications or renewals for up to TEN days. Exact details have yet to be released but you can find out more information on their website at:
http://www.sia.homeoffice.gov.uk/Pages/changes-to-licensing.aspx