Meanwhile, Lethbridge's wife Sylvia had been having affairs with various men, and he himself had begun an affair with Sylvia's younger cousin Mina, who was a secretary at the museum. The couple divorced in June 1943, and in November Lethbridge sold Mount Blow to pay a settlement to Sylvia. He married Mina in July 1944 at Oban, and together they moved from Cambridge to a farm on the Scottish island of Kerrera, where Lethbridge excavated some local caves. But the couple found life on Kerrera too isolated and soon returned to Cambridge, despite Lethbridge's dislike of the place and most of the university staff whom he worked alongside. He nevertheless continued his archaeological investigations, excavating an Anglo-Saxon cemetery at Lackford on Cavenham Heath, and involving himself in the investigation of the newly unearthed Mildenhall Treasure, being the individual responsible for locating its probable discovery spot. He was among the first to take an interest in the cemeteries of the Mid Anglo-Saxon period, believing that the lack of 'pagan' objects such as weapons reflected the fact that those buried in two seventh-century cemeteries were among the earliest Anglo-Saxon Christians. In January 1948, Lethbridge received word that his son Hugh had committed suicide after suffering post-traumatic stress disorder during his time in the armed forces.