Does it matter who funds the Taxpayers Alliance?

The Guardian has been crusading against the TPA over the last few days - http://www.guardian.co.uk/politics/2009/oct/11/prescott-says-tax-group-tory - with some of the Labour Party saying the 'low taxes, low spending' campaign group should declare itself as a Tory front. One of the TPA directors also doesn't pay tax in England, but does any of this matter?