CAP 127: Report of the Court of Inquiry into the Accidents to Comet G-ALYP on 10th January 1954 and Comet G-ALYY on 8th April 1954:
http://lessonslearned.faa.gov/Comet1/G-ALYP_Report.pdf
And a three-part 1955 article from The Engineer with abstracts from the above:
www.gracesguide.co.uk/images/a/a8/Er19550218.pdf
www.gracesguide.co.uk/images/5/56/Er19550225.pdf
www.gracesguide.co.uk/images/8/8e/Er19550304.pdf