We've stopped in Warsaw for the night with a friendly guide (Rich, our 'fixer'). Our route has been further modified after his advice - Belarus is now off the cards. We intend to head North through Lithuania and Latvia to avoid Belarus, as apparently they don't like foreign types and will require us to have one of those 'visa' things. Which, of course, we don't have.
Tomorrow we depart for Lithuania, not Belarus. Hopefully they'll like us.
Dave and Gary