Sorry - just seen this.
I can look at hosting the disc image somewhere - but I need to dig it out from either my laptop or the server - it's been years since I played about with the factory P38 discs. Also from memory (I'm sure I wrote it down somewhere) is needs to be burnt in a specific format/mode or it won't work. I remember going through about 5 discs when I first found the image trying to get it right!
I head away for work again tomorrow - but I'll see if I get a chance to look for it before I leave. If not, then again if you send BECM to me (and radio if you still need code...) in March when I'm home, then I can see about burning a couple of discs for you and putting them in the box