ABC Heywire website goes haywire

The ABC Heywire website is intended for young people. But I would not like to use the site from the mobile phone of a typical young person, as the poor formatting is likely to result in a large download bill. Even on a wired high speed broadband connection the site was slow. I did some checks and found a typical page was 433.4KB: HTML document 132.3KB, stylesheets 72.4KB, images 228.7KB. Most of the space in the HTML was taken up with text which was not normally visible and excessively verbose formatting. The page failed a W3c Validation Test, with 293 errors. The W3C Mobile Okay Checker reported: "This page is not mobile-friendly!".