By Niki Tennant & Zesha Saleem A dad of three tragically died just four weeks after being diagnosed with a rare form of cancer. Steven Black, who was a dairy and arable farmer, was on a “once-in-a-lifetime” cruise with his wife, Pam Black, and close family relatives, travelling around South America. It was a rare escape for the couple – who barely had the chance to escape their farm and 400 acres of Stirlingshire land. However, towards the end of the trip, Steven lost his appetite and complained that his stomach “wasn’t quite right.” His wife, Pam, said: “We read about it and Googled it, as yo…