Is there a method of adding a sidebar with with NAV to the London theme?
Hi @yogibjorn 
You can fully customise London theme by downloading it from the Design view in Ghost admin. I’d then use the secondary navigation and add it in as a sidebar. A little development knowledge will get you a long way with Ghost theming. Here’s some links to get you get started:
https://ghost.org/tutorials/custom-page-templates/
If you’ve got any more questions just ask! The community is here to help 
Would you be able to help with the coding on this? I am intending a side bar in my Headline Theme to include affiliate links.
I don’t think Headline comes with a sidebar? Unless one of the additional templates have it? You might want to select a theme which has a sidebar already built in