Whether Cameron and Osbourne would do any better is speculative. Brown taking us into recession after promising no boom and bust is a fact.
You seem obsessed with a small minority of the population in terms of tax revenues. The amount they may or may not avoid paying is insignificant next to the amount of jobs they create and revenue that delivers to the economy. Lord Ashcroft has created thousands of jobs in the cleaning, car and security industry, as well as financially supporting (42% shareholder) Watford FC. He also founded and is chairman of Crimestoppers (gotta love Wiki). Perhaps he is a sharp accountant, but what good businessman isn't.
This isn't personal, and I've said it before, foxes are vermin.