Hi,
Please open this CSS file:
www.kozihaus.co.uk/templates/yoo_tasty/html/com_virtuemart/assets/css/flexibleVM2Global.css
And look at the 1st line:
@import url(http://fonts.googleapis.com/css?family=Oswald:400,300);
change it with this:
@import url(https://fonts.googleapis.com/css?family=Oswald:400,300);
You will be good to go. We didn't do it by default, because google has faster respond time in HTTP protocol (in order of milliseconds though). But in case anyone uses SSL the http:// must be changed to https:// for google font.
Cheers.