We have now converted the WMV to a Quicktime MPEG1 on the PC.
Now I should be able, with Quicktime Pro to export it as a PAL-DV & import it into iDVD and burn a DVD ..... Is this correct please?

Ugh, sorry Ronni - a bad format choice. Here's a quote from the iDVD help.

"'DVD supports only QuickTime movies with linear video tracks. Other formats, such as QuickTime VR, MPEG-1 or MPEG-2, Flash, streaming or encrypted movies, or QuickTime spanned movies, cannot be added to your iDVD project.

You can't add MPEG-1 or MPEG-2 files to an iDVD project because they don't contain standard video tracks.

You can't use QuickTime Fast Start movies with iDVD. (Fast Start movies are intended for Internet playback.) When saving a QuickTime movie for use with iDVD, click the Options button in the QuickTime Export dialog and make sure that the "Prepare for Internet Streaming" checkbox is not selected."

also

"You can add most video or image files supported by QuickTime to your iDVD project. iDVD also supports high definition video (HDV) and 16:9 widescreen formats, and allowing you to create the highest quality, coolest-looking DVDs possible. High definition video that you add to your project is converted to work with the format of your project. iDVD supports using 16:9 widescreen video, so that when your DVD plays on a DVD player that supports widescreen format, the footage appears in its original aspect ratio. iDVD also supports MPEG-4 and iSight video imported as an iMovie HD movie.

If your video-editing application can export to QuickTime, you can create movies that you can add to your iDVD project. For best results, in the QuickTime export settings, choose NTSC-DV with a frame rate of 29.97 or PAL-DV with a frame rate of 25. Choose No Compression for audio and set the sample rate to 48 kHz.

QuickTime movies smaller than the standard DVD size of 720 x 480 (NTSC) or 720 x 576 (PAL) are scaled to fit the DVD window, which may decrease the image quality."

In Australia we use PAL - 25 frames per second. I don't have any idea of what the PC is capable of outputting, so I don't know how much more trouble you are up for. Could you possibly get the movie out of the PC on tape and import into the Mac as a native Quicktime?

Orrr ... I just had a thought - you *could* demux the MPEG1 - seperate the video and audio files - and then rebuild them as a single quicktime that iDVD will accept. Have a look at .. I think it's called bbdemux - sounds like a bare bones product. Free, anyway.
<http://www.versiontracker.com/dyn/moreinfo/macosx/14618>

Hope this helps