Has it ever been confirmed definitively whether or not Admiral Wilhelm Canaris was in covert contact with Sir Stewart Menzies?

Answer 1

"In the summer of 1943 Canaris met secretly with Stuart Menzies, Chief of British Intelligence, and William J. Donovan, head of the Office of Strategic Services, at Santander, Spain. Canaris presented Menzies and Donovan with his peace plan: a cease fire in the West, Hitler to be eliminated or handed over, and continuation of the War in the East. But though Donovan, Menzies and Canaris reached an agreement on the basis of Canaris' proposal, President Roosevelt flatly declined to negotiate with 'these East German Junkers' and called his presumptuous OSS chief to heel. Canaris' peace offer was rejected .." Louis Bulow www.canaris.dk I don't know if this would classify as confirmed definitively, however I think the evidence is pretty overwhelming that Canaris was in contact with MI6 and other intelligence agencies throughout the war. A most unsung hero of WW2 who was brave and heroic to the end.