The is now receiving the March security update in the UK. The OTA update comes in at 74.34MB, and includes the latest as prescribed by Google.
In addition to the monthly patches, Google is rolling out a to Nexus devices to address an exploit in the Linux kernel. However, the Galaxy S7 and the S7 edge do not require the update as they run a newer version of the kernel (version 3.18.20) that is immune to the particular exploit that is affecting Nexus phones.
The March security patch is also likely to find its way to the standard variant of the Galaxy S7 shortly, although we don't have a confirmation of the same at this time. If you're using the Galaxy S7 edge in the UK, head into the settings to download the March security update.
