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Legal action pending against them as they don't give up - been averaging 15 emails a day stuffed with dodgy "leads"......they're parasites, and like most of these so called "trade lead" places, probably can't deliver what they APPEAR to promise (yet don't when you read the print that isn't as large as the rest.
Essentially, they're selling you a list of names which might have expressed an interest in something vaguely electrical/security/fire at some point in some poll site - or have put in a planning application, etc - for which they'll charge you around £25 + a name.
Buy a mailing list if you have something to say to loads of folk at once - quicker, cheaper, better received, and you have control over what's said, who's contacted.
Better still, invest in the website, and google ranking it.