Thanks!

I'm just in Aspire now and using the 'S' fit curves to selected vectors tool. I can see the difference in file size immediately. I just need to remember to tick the 'replace selected vector' box otherwise end up with two files on top of each other.

I see a 'T' tool in vectror curves section of Aspire which is convert objects to curves. Similar or not, or for another day I wonder?

thanks