Wrightbus of Ballymena built its first double-deck body in 2001, naming it the Eclipse Gemini. Unlike its rivals, it was available on the DAF/VDL and Volvo chassis. Arriva London was a big customer for the type, taking stock of both the Volvo B7TL and DAF DB250 models, being the only customer for the latter model. First and Go-Ahead London took stock of the Volvo B7TL model. The Gemini 2 model was launched in 2009, again only on the VDL and Volvo chassis. Arriva London, First and Go-Ahead London were quick to snap up further examples of this new model, the integral VDL DB300 model (Arriva) and the newly introduced B9TL. The Volvo B5LH hybrid chassis became available with Gemini 2 bodywork in 2008 and was received well by London operators. 2013 saw the launch of the Gemini 3 body style, which varied slightly from the Gemini 2 in appearance.

In 2014, the Gemini 3 gained the same appearance of the newly launched Streetdeck model, drastically changing the appearance of the Gemini.