arem, I would like to see your fathers photo's, being a Skyways / York fanatic ! Have you tried photobucket ? I find it very easy now, having overcome the first few 'not knowing what to do' things !
Back to the photo's above, I first thought the York was from Skyways, but looking at the logo / badge behind the cockpit, compare with the Bristol 170's logo, the majority of the larger 'arrow' is pointing aft as the Air Charter logo, whilst on Skyways aircraft the larger 'arrow' in their logo pointed forward ? see my photo below of Skyways York (via photobucket). Keith.