I've now got this information from Mark Lewisohn, which I'm going to use in my finished article:
The Honeys was a British group, consisting of three sisters in close harmony. Their true surname was Liddell and they began ca. 1952 as the Liddell Triplets. By 1963 two had married so their names were Pearl Liddell, Anita Lockhart and Vilma Harvey.