Hi Mark,

> I just tried it but couldn't get the blend to work...

To blend between two surfaces you have to pick the edges of the surfaces not the curve you generated them with, to do this, hide all your curves so you don't get confused between picking a curve and a surface edge, then pick the surface, mouse over the edge and pick again to select the edge, do the same with the surface you want to blend to and select Construct>Blend and a surface should be generated.
Play around with the options to see what affect they have.

If you need a mini tute let us know.

Cheers
~Danny~