Out of some 2.34m privately owned London homes, only 210,000 are valued below £120,000 and therefore exempt at present. Under the Tory plan, around an extra 800,000 would be exempt, taking the total to more than a million. In the South East outside the capital, just 276,000 out of 2.12m homes are exempt. The number who would not pay would leap to 1.45m - more than half of them.