I've been alerted to an anonymous complaint concerning a UK vanity press.
It concerns a writer who withdrew his submission as soon as he realised that he was dealing with a vanity press rather than a mainstream publisher. He asked for his material to be returned: but he's alleging that now publication is no longer an option the vanity press is ignoring all his attempts to contact it and has not returned any of the materials he supplied, despite repeated requests for it to do so.
Now, in this writer's situation I wouldn't be too worried: I'm sure he won't have been foolish enough to send in his only copy of the material, so he should still have a copy at home, safe and sound, to submit to somewhere more reputable; and this vanity press isn't going to publish his book unless he pays for it to do so, as it just doesn't have the sales channels available to make money by actually selling copies of it like good publishers do.
However, if you have had similar (or more sinister) problems with a vanity publisher I'd really like to hear from you, either in the comments to this thread or by email. You can reach me on "hprw at tesco dot net", and I'll keep all correspondence confidential.