Bill Grant was first elected as a Conservative councillor on South Ayrshire Council at the 2007 Council elections, being elected to serve as one of four councillors in the Ayr West ward with more First Preference votes than any other candidate in the ward at 2,176 votes, taking more votes than fellow Conservatives Robin Reid and Alistair Kerr. He was re-elected in the 2012 Council elections with 1,992 First Preference votes, again with more First Preference votes than any other candidate, including fellow Conservative Robin Reid. Grant stood as the Conservative Party candidate in Ayr, Carrick and Cumnock at the 2010 UK general election, coming in second place behind Labour's Sandra Osborne with a total of 11,721 votes, an increase of 2.4% from the previous election of 2005. He successfully gained the seat for the Conservatives at the 2017 general election from the SNP'sCorri Wilson, taking 18,550 votes ahead of the SNP's Corri Wilson on 15,776 votes, with a 2,774 vote majority, on a 17.5% swing from the SNP to the Conservatives. Grant made his maiden speech to the UK House of Commons on 3 July 2017. In his first year in office as an MP, Bill Grant spoke in 89 debates and voted in 266 out of 284 votes in the Parliament, well above average amongst MPs. During this period, Bill Grant only rebelled against his party once in the appointment of Sir Ian Kennedy as Electoral Commissioner. Grant was a proponent for the United Kingdom remaining a member of the European Union during the 2016 United Kingdom European Union membership referendum. He subsequently declared his support of Prime Minister Theresa May's negotiated Brexit settlement provided that assurances were made on the issue of the Northern Irish backstop and UK fishing rights. Grant announced in September 2019 that he would not contest the next United Kingdom general election.
Personal life
Grant is a member of the Kyle and CarrickCivic Society, the Alloway Rotary, the Ayr Classic Motorcycle Club and the Ayr Building Preservation Trust. He is a keen DIY, gardening and motorcycling enthusiast. During his time as a councillor for Ayr West, Bill Grant was well known to be found picking up litter in Ayr over the weekends. In March 2018, Bill Grant performed a citizens arrest in Bridges Bar, Ayr, while out for a drink against a man responsible for physically assaulting the landlord of the pub.