Double-decker bus
The first commercial horse-drawn double-decker omnibuses were introduced in England in 1847 by Adams & Co. of Fairfield, Bow, then improved upon by John Greenwood, who introduced a new double-decker in 1852.
Wright Pulsar Gemini HEV
The Wright Pulsar Gemini HEV was a hybrid double-decker bus manufactured by Wrightbus. It was the first hybrid double-decker in the United Kingdom. It was based on a VDL DB250 chassis, without the engine a diesel and battery combination hybrid engine being used.