George Osborne Tax Dodger?

On Radio 4 a few minutes ago George Osborne claimed he was not a 50p tax payer. I have just checked and the Ministerial salary falls just below the threshold at around £450,000. But is this his only source of income? The interviewer raised that question but quickly backed-off (I suspect the producer whispered in his ear). It can't be the case that Osborne has no other source of income; perhaps he has accountants to make sure he pays no tax on this additional income. It would be interesting to know. Wikipedia says this: "He has an estimated personal fortune of around £4 million, as the beneficiary of a trust fund that owns a 15-per-cent stake in Osborne & Little, the wallpaper-and-fabrics company co-founded by his father, Sir Peter Osborne". Not a 50p tax payer?