Major visual issue with cycles rendering Im rendering a scene using cycles which looks absolutely perfect when rendering in view port mode as you can see in the first image 
But when I finally render it, it looks like this
I'm using 2.79 and i tried it on 2.78 with the same result.
any help is appreciated.comment below if you need more information
I have fixed the issue,

most of the objects had suddenly had invisibility checked, uncheck these and it will appear fine