With all the vilification of Ashcroft going on, I thought I'd offer a brief and different perspective. As far as I can tell, Ashcroft's businesses are all legitimately based in the Caribbean. He is not doing anything illegal or contrary to the tax code.
At the same time as he is legally minimising the money he pays to this profligate and useless government (and the useless and profligate governments that preceded it!) he still finds the time and pocket depth to fund charities that he believes are important and education in the UK -- with his own money.
Also, quite unlike many other rich Lords, he hasn't been sticking his hand into the taxpayer's pocket for fraudulent "expenses" (as far as we know, and I'm pretty damn sure Labour would have been all over him if he had!)
Now, as far as I can tell, the business of him being a non-dom is also entirely irrelevant. It's not illegal and frankly, I have no idea why people think it's an issue. Ask any ex-pat from any country in any of their new domiciles whether they still have a keen interest in the homeland and almost all of them will. So it's not unnatural for Ashcroft to be interested in UK politics even if he has no business interests here.
As far as I can see, Ashcroft is doing nothing that is morally different from you or I taking the full benefit of the pitiful tax-free allowance that Gordon deigns to give us all.
He may have faults, he may be a closet ogre, he may be a fool for supporting the Tories rather than LPUK, but his tax affairs are not any reason to vilify him and he does have many praiseworthy qualities.