Files Permissions after upgrading to latest versions of plugins

Newly upload files and existing files are no longer accessible on my server after upgrading to the latest wordpress and installing new plugins from WPMUDev

I believe it to be an issue with file permissions and wondered if you could advise what files permissions should be for the files and the folders

http://theyogaeffect.andyfielder.co.uk/files/2015/10/sarah.jpg

is an example