The Speedway Grand Prix of Great Britain is a motorcycle speedway event that is a part of the Speedway Grand Prix (world championship) series.
The Millennium Stadium hosted the British GP for the first time in 2001 until 2025. The National Speedway Stadium in Manchester was included as a venue for the 2025 Speedway Grand Prix in addition to Cardiff but the 2025 Grand Prix in Cardiff was cancelled in December 2024 and replaced by a second GP in Manchester.
The Millennium Stadium (Welsh: Stadiwm y Mileniwm), known since 2016 as the Principality Stadium (Welsh: Stadiwm Principality) for sponsorship reasons, is the national stadium of Wales. Located in Cardiff, it has a retractable roof and is the home of the Wales national rugby union team; it has also held Wales national football team games. Initially built to host the 1999 Rugby World Cup and replacing the National Stadium, it has gone on to host many other large-scale events, such as the Tsunami Relief Cardiff concert, the Super Special Stage of Wales Rally Great Britain, the Speedway Grand Prix of Great Britain and various concerts. It also hosted FA Cup, League Cup and Football League play-off finals while Wembley Stadium was being redeveloped between 2001 and 2006, as well as football matches during the 2012 Summer Olympics.
The stadium is owned by Millennium Stadium plc, a subsidiary company of the Welsh Rugby Union (WRU). The architects were Bligh Lobb Sports Architecture. The structural engineers were WS Atkins and the building contractor was Laing. The total construction cost of the stadium was £121million, of which the Millennium Commission funded £46 million.