I get calls about these every so often, people who sound lot like recruiters but give away the fact they're selling dodgy schemes after a while.
"We can enable you to take home more than 90%!"
"Err, Right, how can you do that then?"
"By structuring your profits through our scheme! We use a combination of tax-haven bank accounts and directors..."
"I'll stop you right there, isn't this what Jimmy Carr off the tv just got spanked for? No thanks, sounds highly unethical to me."
That said I do do things the 'usual' way and pay myself a small salary, with the rest coming in as share dividends. I'm not sure exactly what proportion I pay in taxes vs a salaried employee, but it's non negligible - 20% Corporation tax on all profits (before I get paid), and 25% dividend tax on anything I get paid over the Higher Rate threshold.