Thanks to cmb and mrzaz for the response.
Now that I have checked from an outside host, I seem to be able to browse the web server – which I couldn't from inside, which means redirection is working. Also, I didn't know that they could be handled in such a different way in PF -- apparently a lack of experience with that.
But that solves the trouble for the time being. Thanks for the links to pf doc, I'm reading it at the moment.
Thanks again.
Regards