Yes. London Calling is one of the few adventures that were published for Dark*Matter, and appeared in Dungeon magazine, I think, eons ago. Then the rights to it were aquired by
www.alternity.net, who Wizards pretty much turned over Alternity to when they let it die.
Right Here you can download it as a PDF, should be at the top of that page, from Alternity.net. You'd have to stat it up for D20, but that's not too hard, seeing as Dark*Matter adventures are about 90% flavor and investigation. Instead of Ordinary/Good/Amazing successes and revealing information on each of those you'd, say, give a DC for each bit of knowledge ... 15, 20, 25 etc. There's a monster in there and a Diabolist, both of which should be easy enough to grab a similar D20 creature to fit in ... mmm ... Diabolist I'm not sure. D20's magic system takes Dark*Matter's flavor and sort of poops all over it. Honestly, the Diabolist's skills and abilities are probably tertiary to the adventure, unless your group horribly bungles something. Wizards, in Dark*Matter, are only really powerful when you don't know they're there. Summoning demons, binding demons ... sending demons out to rip your foes to small pieces. Give the guy "Produce Flame" a handful of times and that should do it. The other spells all take place "Off Camera" so to speak, so you don't really need to use them within the rules.
BAH. I wish there was a good d20 Dark*Matter out there professionally done and released. Make me a happy clam.
Actually I wish Wizards would OGC Hoffmann. ...
EDIT: And just taking a moment aside. If you haven't gotten your hands on Dark*Matter before, you should. It's probably my most prized roleplaying possession. It's a concept that can be applied to any ruleset, really, so 85% of the old book is useful to WHOEVER picks it up. The only real rules in it are some stats for monsters, some stats for magic, and ... well ... that's it. The monsters you can easily convert. The magic is a little more problematic, since (as I've said) fire-and-forget Vancian magic just doesn't do the feel of FX justice. Neither does the Psionics system. OGL Horror, D20 Call of Cthulhu, and Psychic's Handbook all seem to work okay. Of those I only have CoC and it's rules seems to work OKAY. But if you go
RIGHT HERE you can download the original Dark*Matter book for 4.75 ... for the cost of a freakin' hamburger combo you too can have the greatest role playing accessory on earth.
Do it today.
That is all.
--fje