Security Operations Center (SOC) and Security Incident and Event Management (SIEM) solution and Antivirus

We would like to invite suppliers to detail their proposals to providing a replacement Security Operation Centre (SOC) and Security Incident Event Monitoring (SIEM) solution including Antivirus that will be used by our Information and Communication Technology (ICT) Team. We require a fully managed 24 x 7 x 365 service including all associated software, hardware and licences.