Mallalieus of Delph is a proud member of the British Wool Marketing Board, who work to promote the use of natural wool fibre internationally. However, even though the mills take pride in sourcing as much of their wool as possible in Britain, for finer wool the climate must be far warmer than that of the United Kingdom, and for these wools the company sources from farther afield from countries like South Africa and New Zealand. Managing Director, Clive, goes into detail about the wool's origins. “We only work with high-quality wools whichever country they are sourced from,” he explains. “There is a change in hand-feel from different climates, British wool generally being coarser than wools from South Africa or New Zealand.” He elaborates that the coarser wools are the perfect texture for use in heavyweight fabrics such as those used in fieldsports or gamekeeping – where the weight would be required for the protective qualities in the garment, "although we are finding more and more that these British Wools are also now being used in lighter weights to bring the country fashion market to the wider market."

Mallalieus of Delph was formed in 1863 as a producer of Pure New Wool fabrics. Based entirely in the Yorkshire town of Delph, the company has never left the quaint English countryside as the mills have grown. The company has been passed down through 5 generations of the Mallalieu family, dating back to 1863, and still remains very much a family-owned business. Mallalieus of Delph is also, first and foremost, a British company producing all of their products at the mill's home in Delph, a small village on the Yorkshire/Lancashire border within the Pennines. Moving to a larger location within the village, the mills were able to increase production to meet their increasing demand.