Here's the background. I was recently involved in a dispute with a large insurance company, the FOS made a recommendation to that company that they honour the claim. The company agreed. The claim will cost said company £12k BUT will take 2-3 months to rectify the issue. I have asked them if they'd agree to a cash settlement, they replied saying "sure, but we're only giving you £10k and we want you to sign an NDA".
now, here's the question. i can expose this company big time, and have a tonne of evidence against them. I also have the ability to reach hundreds of thousands of their potential customers with a bit of facebook advertising, for a couple of hundred quid. So, can i turn around to them and threaten them with this, or is that blackmail?