Thanks to everybody who commented, well....
On the one hand I'll openly admit I've had no experience with CAD software, scraped by at maths at school ( got my 'o' level but pursued it no further ) and from what people here have said there is a bit of a learning curve involved.....so I might be better off trying Autorealm
On t'other hand CC3 does seem incredibly versatile, powerful and well supported and most important of all some of the maps are absolutely beautiful.
I shall have to mull it over . but at present I can feel my credit card calling out: " use me, use me you
know you want to
"
I've always liked maps and it was maps in RPG's that inspired me to start doing my own, specifically the ones in MERP and the one in the back of the RQ2 rule book showing Dragon Pass and Prax. That was a real revelation to me, that whole cartographical style was something I'd not seen before and it made a huge impression.