Llanon
You're right, I thought I'd read more about this accident and have now re-found the following :
1958 London Vickers Viking accident - Wikipedia, the free encyclopedia
Which then in turn caused me to find :
1959 | 1877 | Flight Archive
A whole parade of lined-up holes in the Swiss cheese. I feel sorry for the crew, who must've been extremely tired and under tremendous pressure, and plus of course, the innocent victims on the ground.