Travers so disliked the Disney adaptation and the way she felt she had been treated during the production that when producer Cameron Mackintosh approached her years later about making the British stage musical, she acquiesced only on conditions that British writers alone and no one from the original film production were to be directly involved. That specifically excluded the Sherman Brothers from writing additional songs for the production. However, original songs and other aspects from the 1964 film were allowed to be incorporated into the production. Those points were even stipulated in her last will and testament.