WC ROUGHTRAD Bta, Regular is in the ballpark.

Sketch Block is a slab serif variation.

Carbon Offsets is a serif variation.

Thanks for the reply,
Yeah I know of these fonts - but this particular one is almost like a rough version of Helvetica... any thoughts anyone?

this particular one is almost like a rough version of Helvetica

Actually that "t" isn't much Helvetica-like. But there's always Handvetica.
http://www.dafont.com/handvetica.font

Where do you found the sample?

I found it on this nice looking site:

http://www.carbonica.org/

Woah, even the buttons and icons are custom sketched on the site.

The site was created by Creative Jar and I'd imagine that the font is a custom aspect of their brand.

EDIT: I grabbed a SWF file off the site and took a closer look at how they were handing the sketched type. Below you'll see there are individual JPG for each letter.