Using the Hay skin causes all axis labels to disappear. 

Forest:
<text fill="#3c4c30" style="font: 16px Arial,Helvetica,sans-serif" transform="translate(-6,6) rotate(-90,25.5,193.25)" fill-opacity="1" y="200" x="10">KGs</text>

Hay:
<text fill="WHITE" style="font: 16px Arial,Helvetica,sans-serif" transform="translate(-6,6) rotate(-90,25.5,193.25)" fill-opacity="1" y="200" x="10">KGs</text>

You can see this by going to your demo page and selecting the Hay skin.
http://demos.telerik.com/aspnet-ajax/htmlchart/examples/overview/defaultvb.aspx

Any work around available?

Hello Neil,

There seems to be an issue with the Hay skin in the RadHtmlChart, so that the title, axes labels and legend labels are set with white color. I have logged the issue in our feedback portal here, so that you can monitor, comment and vote on it.

For the time being you can set the desired colors of the title, axes labels and legend labels through the server-side TextStyle property.

I have also updated your Telerik points for reporting this issue to us.

All the best,
Danail Vasilev
the Telerik team