In the new year Sophos will be making a change that means the virus engine running in version 1.2.0 of SVMs will no longer be supported.
Whilst we haven't supported version 1.2.0 for several months, we want to advise all customers of the need to reboot their SVMs in order to complete any pending updates. 
Note: We recently ended support of v1.3.0; this followed the release of v1.3.2. Sophos will typically support the current and previous version of SVE and always recommends keeping your SVMs up to date.
You can check the version that your SVMs are running either by viewing the SVM details in the Sophos Enterprise Console or in Sophos Central, or by checking that the thin agent on your GVMs in Programs and Features is 1.3.1 or later.