Blog posts not appearing

For some time now I have been unable to access my blog posts on the front end of the site. When I click on the post’s link, it redirects to the contact us page and says ‘Page not found’. My host is Evo, I have contacted them about it and they say it is a WordPress issue.

I have tried deactivating all plugins, and reactivating one by one. I have also reverted to the default theme. These actions have made no difference.

My site is fostereditorial.co.uk. Any advice would be greatly appreciated.