Quite simply, there will be hell to pay if I'm on it.
Let's go through it piece by piece.
1 - When I provide my details I make a point of checking the terms under which this is collected. If it states ANYWHERE that it will be handed off to 3rd parties it's abort (or untick if that option exists). This means my information should NOT end up there.
2 - If they have acquired my information they have various obligations themselves, like checking if the data they have received is accompanied by the appropriate permissions.
If I find they hold my data, two things will happen.
1 - A formal complaint about 118800 itself will go to the Information Commissioner - not only has my data been illegally obtained, it has also not been handled with the appropriate care (I'll come to the "why" in a minute)
2 - a separate formal complaint will go to the IC about illegal provisioning of information, and again bad maintenance of information (another obligation). I don't know who did it, but 118800 will have to answer the IC investigation, and via that find the abuser. I've had it so often the someone calls me because I'm allegedly "on a list" that I would really like to nail the people who made that list. So far. that appears to be total BS.
Now, obviously the IC isn't going to move as much as a foot with just one complaint, so I suggest you do the same. Get your facts, than hit them.
I haven't yet explained why I can claim "bad data maintenance" - there is a requirements to ensure the data you hold is up to date, and I have solid evidence that hasn't happened.
You see, I left the country 5 years ago..