Hi Stef
I solved the problem.
The tab in Sublime Text where I was editing the my_friends.html code was not affecting the code in the sub_pages folder for some reason. When I checked the source code from the web page itself the ../ was not present even though it was in the code editor. Once I closed the tab and dragged it back into Sublime Text from the sub_pages folder it all began to work fine.
Thanks for your help.
Rich