Can't get android 7 on galaxy s6 I have tried manually updating my galaxy s6 but it says I have the latest (6.0.1) but I know this isn't true! My friend has practically the same phone but with android 7. How do I update mine?

This is a screenshot of the manual update:
Updates are always rolled out in batches to different regions (even the same exact  model could be sold around the world). For your region (G920FBTU5DQA2 - BTU - United Kingdom), as SamMobile states, 6.0.1 is indeed the latest.

You could always manually flash firmware for the same model but for another region (listed on the same page) via Odin, at the cost of potentially losing your data (back up first) as well as certain region-specific optimizations.