Robbiesmum,
Thank you. You are right. This was absolutely our Francis Boustead, one and the same man who provided the key evidence in that trial. The Judge, in summing up, told the jury that if they believe Francis Boustead then Graham must hang. If they didn't believe Boustead then Graham would be guilty of manslaughter not murder.
The jury didn't believe him and clearly felt that he had provided the information, which was damning regarding premeditation, solely for the reward. The Judge in sentencing Graham to transportation for manslaughter said that he agreed with the jury. The police officer in charge of the case defended Boustead who pointed out he had conveyed the crucial information to his wife Sarah even before the reward was offered. A fascinating case. A footnote to the story is that some time after Graham had been transported, his brother spotted Francis Boustead in a local pub some time later and significantly assaulted him leading to his own conviction for assault.
Sadly though you are also right that I remain stuck any record of the marriage I seek.