Many Thanks for both your replies.

Bill: the Intersection curve tool is just what I have been looking for, once I understood it.

I'll try the convert entitys next.

Just after writing the email I tried projecting a circle curve on 'teapot' surface, sweeping (pipe)it then using it to trim
cutting both spout and body, then creating a fill between them, then apply knit, then thicken. It looked ok...

Thanks again

Simon