Thanks once again Sleepless - normally my very zealous virus checker spots problems as I'm downloading, but I ran a check just in case and the file is 'clean' so to speak.

Oh, now I know exactly what you mean about variable bitrate - it turns out that the file has a bitrate of only 126!
Seems ok though, having checked it I gave it a listen, maybe I haven't got a good 'ear' but it sounds ok.

Anyway, really thanks again, no doubt I'll be back!