Grundy was
elected to represent the
Lowton East ward on
Wigan Metropolitan Borough Council as a councillor in the
2008 local elections. He was elected to
Parliament at the
2019 general election, taking the seat from
Labour's
Jo Platt. This made Grundy the first ever Conservative MP to represent the Leigh constituency since its creation. Grundy's general election campaign pledges included respecting Leigh's
vote to leave the EU in 2016; fighting for vital local transport infrastructure, such as the completion of the Atherleigh Way Bypass, and the re-opening of
Golborne and Kenyon Junction stations; and securing investment for Leigh's town centres. In 2020, Grundy put forward two bids to the Government's Restoring Your Railway Ideas Fund, progressing his pledge to get Kenyon Junction and Golborne Station reopened, following their closure after the
Beeching Report. The latter is due to be reopened in 2027. During the
COVID-19 pandemic, Grundy was actively involved in supporting local people and local businesses. He supported local market traders' calls to open food stalls at Leigh Market as soon as the Government lifted restrictions. In February 2020, a video recording obtained by
LBC showed Grundy publicly exposing his genitals in front of a woman at an event in the Rams Head Inn, Lowton, in 2007. Since the event, Grundy has apologised for the incident and the distress he caused. In the summer of 2020, Grundy launched his "Shop Safe, Shop Local" campaign, which encouraged local people to return to their local high street following the Coronavirus pandemic. The petition gained hundreds of signatures, and encouraged
Wigan Council to deliver two hours' free parking on weekdays in Leigh's town centres, increased hand sanitization stations on the high street, and free face coverings for shoppers provided to local independent businesses. As MP for Leigh, Grundy wrote regular columns for both the
Wigan Observer and
Leigh Journal, to update constituents of local issues. Grundy announced in May 2024 that he would step down from Parliament at the
forthcoming general election. ==References==