Website Content Suddenly Disappeared (Front End)

Hi there,
I'm wondering if any of you have any ideas on the issues I'm currently having? When I visit my website (www.altoncars.co.uk/customer) everything which was once text has now disappeared. All the content is still showing in the back end editor however when I try to open it in my browser, everything disappears.

Some content does show on other pages but the majority of content is missing. I haven't installed any new plugins recently so I doubt its a new plugin causing any conflict?

Does anyone have any ideas on what to do?!

Thank you.