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We have a product here that emits a tone everytime you pick up the phone that sounds like your line is disconnected. It only emits the tone for a moment, then the call resumes as normal. I guess that telemarketing software detects this tone and ends the call before you say "hello". Best yet, they usually remove you from their call list automatically. Called a "telezapper" or something. Do they offer a product like that in the UK? Would it work?

No. We don't get stuff like that over here. I'm not sure it'd even do anything. It'd only fool the most basic and ancient equipment since most new stuff would be connected via a digital line which does OOB signalling. They'd know if the number was disconnected or just emitting that tone.