Streatham Differential Doubles

Only allowed by the Central Council due to a relatively recent rule change, this method was named in 1994. It is unusual in that the Treble and 2nd follow one blue line, which is 40 changes long, while the 3rd, 4th and 5th follow a separate blue line, 60 changes long. The plain course thus contains 120 changes and is rather fun to ring. The double-dodging at the back is like Stedman, but at the opposite stroke, so beware.

Treble and 2nd 3rd, 4th and 5th All together!