No — John Douglas is not confirmed to be left-handed, as no reliable public source currently confirms his left-handedness.

John Douglas is a Scottish musician, best known as the guitarist and songwriter for the critically acclaimed indie pop band Trashcan Sinatras. He is a founding member of the band.

Hailing from Irvine, Scotland, Douglas helped form Trashcan Sinatras in 1986. The band gained recognition for their melodic songwriting, intricate guitar work, and literate lyrics.

Over the decades, Trashcan Sinatras have released several studio albums, including 'Cake' and 'A Happy Pocket,' earning a dedicated cult following. Douglas's guitar style and songwriting have been central to their sound.

Beyond his work with Trashcan Sinatras, Douglas has also been involved in other musical projects and collaborations. He continues to perform and record with the band, maintaining their distinct musical identity.