Side view of the Vickers Viscount.

It doesn't look very big from the outside, but like the TARDIS, it was very spacious and comfortable inside, carrying up to 75 passengers. The windows are also much larger than modern airliners, almost twice the size, which might give a false sense of proportion. This, along with how quiet and comparatively free of vibrations they are, might explain why the Viscount was so popular. 445 were produced, the first in 1953, going through eight or more different types. I think this is an 800 (or 860) model.

The Viscount was the first medium range (it could go almost 1800 miles without refuelling) turboprop airliner developed, making it the first jet-powered aeroplane in commercial use in the world. It was conceived during the Second World War when the government's Brabazon Committee thought jet technology could have a use for air transport in peacetime as well. Commissioned in 1944, the first prototype flew in 1946, but it was another seven years before a larger version was developed that could carry more passengers and make it cost effective. British Airways still operated Viscounts until the late 1980s, when the older planes were scrapped, and the newer ones sold to charter airlines in South Africa, where some continue to fly to this day.

More information:
http://www.oldprops.f9.co.uk/props1/Viscount.htm
http://en.wikipedia.org/wiki/Vickers_Viscount