I put some effort into researching this a few months ago, and so far as I could find there is nothing at all available which
(1) does personal accounts, including stocks-and-shares portfolios
(2) does small company accounts, including VAT
(3) imports Quicken data files.
Even if you're willing to frop the stocks-and-shares stuff you can't import Quicken data into a current version of Quickbooks!!
So ... if you find something, do let me know. I'm currently surviving with an ever more flaky (crashes, refusals to print etc) Quicken 2000, with more than a decade's data.