The partnership between Wickes and the cancer charity began in 2006 after a staff vote, and the DIY retail chain says there is plenty of life left in it.
Over the last eight years, the company's 6,000 staff have raised around £3.8m, with fundraising activities including an eight-day trek of Alaska
and a 'Three Peaks Challenge' mountain climb
Staff have twice been given the option to vote for another charity to support, but on both occasions have chosen to stick with LLR and on the last occasion in 2012, by a 75% majority.
Regional operations manager at Wickes, Colin Contini, said: "We regularly ask colleagues, but the vote has been overwhelming whenever we've done that, so it feels as if there's plenty of life in the partnership."
Since 2012, customer relationship management promotions have helped raise money for LLR.
The charity receives 50% of the profits from the sale of special wheelbarrows and buckets in the charity's colour, red.
Corporate account manager at LLR, Rowan Parkes, said: "We've increased the different fundraising techniques each year. It is currently our largest corporate partnership."
Mr Contini added: "The colleagues who give up their time to raise money see where that money goes and get recognition from the charity. It's really alive in the stores and the business."