If you are with BT, or even some of the operators who back you straight off to the BT service, then you can block all calls without a valid CLI (Call Line Identifier), the phone doesn't even ring at your end.

It's a bit of a broadsword approach, and maybe a little draconian but it works. We used to use it, but my sister blocks her CLI so it does have it's problems.

I did receive a call using an off-shore dialler a few weeks ago, and I let them try to sell me a PPI recovery service, at least until I got their details. Then asked for their Data Controller and informed her I was reporting them to the Data Commissioner for misuse of Personal Data, I also reported them to Ofcom for failure to adhere to the TPS. I don't suppose they were bothered about OFCOM, but they were very quick to confirm my details had been removed under the Data Protection Act.. The company?

Help Your Claim Ltd
86 Deansgate
Manchester
M3 2ER

Named and shamed!

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Never underestimate the power of stupid people in large groups.