There is a particularly good article on "This is Money", about the endowment policy mis-selling scandal.
It covers the activities of the Prudential during the 80's and 90's. It seems that in 1993, internal investigations carried out by Prudential uncovered "evidence of widespread activity intended to deceive customers".
To my view it makes damming reading; not just in terms of the activities of the Prudential, but also in terms of highlighting the aggressive selling policy adopted by the life assurance industry at that time.
The article can be read in full at "This is Money".