Link to a page where the issue can be seen: hidden link
I encounter a conflict between the WPML plugin and chauffeur booking. Since I last updated the WPML plugin, the site is very slow and sometimes it doesn't load at all. As soon as I deactivate one of the two plugins everything works again.
Apparently the said plugin isn't in our compatibility list (https://wpml.org/plugin/) so I am not exactly sure about it. You may perhaps need to contact with plugin author too.