Downloaded the burner from IMG's own site and it worked a dream.
For the benefit of any other readers of this thread, it would seem that the problem I was having burning from within WMP relates to the fact that I'm using a laptop, because after doing the burn, ImgBurn ejected the disk with the message: ''Attempts to auto close drive tray failed, which is typical of laptop slimline drives. Close it manually and click OK''. The program proceeded to verify the data and voila! Perfect copying, including a couple of tracks that had errored in WMP. Thanks for your help, I can only repeat your own testimonies of this being the best burner, and will use their associated software for burning DVDs in future.