Just 48 hours before lodging its candidature file in London, the organising committee confirmed a sixth major commercial backer of the city’s bid – global drinks conglomerate Diageo.

The announcement was made at the company’s cooperage in Port Dundas, with the help of Scottish hammer record-holder Shirley Webb.

They join BBC Scotland, Clydesdale Bank, First Group, Highland Spring, and O2, whose overall backing is worth an estimated £1.5m. Major supporters have exclusive access to the Glasgow 2014 brand identity, logo and tartan.

However, the biggest investor in the Games is the Scottish Executive, which has agreed to cover costs 80-20 with the city. Irrespective of the format of the new administration after last week’s elections, it will not affect Glasgow’s bid.

“It has cross-party support, and we have guarantees from all party leaders, who are massively behind it,” said spokesman Rob Shorthouse.

“It would be presumptuous of us to talk to anyone before the shape of the new administration has become clear, but we expect whoever is First Minister will be present in Sri Lanka when we make our final presentation before the vote on November 9.”

Derek Casey, director of Glasgow 2014, said: “Diageo are the latest big name to join the team. Thousands of Scots, companies, and organisations have backed the bid. Working together we can win these Games for Scotland.” Bryan Donaghey, managing director for Diageo Scotland, said: “Diageo is delighted to support the Commonwealth Games bid, not just in financial terms, but also through the huge enthusiasm and encouragement of our 4000 employees across Scotland."

Glasgow’s 600-page bid document travels to London by rail on Tuesday and will be handed over to the Commonwealth Games Federation on Wednesday along with that of Nigerian rivals, Abuja.