The facts: Bobby recorded one 45 rpm record on Magnasound 45-701: Terry b/w Bye Bye Blackbird. One side a John D. Loudermilk song, the other written by Dixon-Henderson. Released December 1963.
Magnasound is a subsidiary label of Monument records. The song is labeled as "A Norro production". Without a doubt this is Norro Wilson, the country singer/ songwriter, who worked for Monument records.
Listen to a sample of Bye, Bye, Blackbird.
Google does not give many clues to the name Bobby Wattrell. He probably hasn't recorded any more as a solo artist.
The family name Wattrell seems to be not very common. Which gives me hope that someday someone somewhere will happen to find my page and be able to tell me more about the singer...