In about 1811, John Clinch, a prominent Witney banker and landowner, and his son James Clinch purchased the Marlborough Head PH at Church Green, Witney. James founded the first Clinch Brewery at the Marlborough Head between 1811 and 1814. His brother John Williams Clinch I was also involved in the enterprise. John Williams Clinch I inherited control of the family bank, J.W. Clinch and Sons, in 1828. (Controlling interest in the bank was sold in 1878 and the bank was later absorbed by Barclays Bank in 1907).
After the death of his brother James in 1857, John Williams I assumed control of the brewing aspect of the now extensive Clinch business portfolio (including banking, landowning and farming among other interests). The early death of his eldest son John Williams Clinch II in 1861 led to the brewing and other businesses coming under the day-to-day management of second son William Clinch. The family business seems to have come more firmly under the control of William and his brother James Jr by 1867, after the discovery that an ailing and increasingly senile John Williams I was found to be misappropriating funds from the family banking business. John Williams Clinch I died in 1871 and William and James Jr's control of the brewery and other businesses was formalised as part of an extensive family indenture document in 1874. The indenture resolved several disputes and required William and James to effectively 'buy out' a large number of family members for large cash sums and yearly annuities, plus pay the gambling debts of a younger brother. The indenture marked the partial dismemberment of the business 'empire' which had been built by John Williams Clinch I and his father John.
James Jr died in 1877 leaving William with a controlling interest. William's only son died young, so in 1883 William went into partnership with his sons-in-law Thomas William Foreshew and Bellingham Arthur Somerville. Upon William's death in 1891, his brewery business interests passed to both sons in law. William had managed to hold the family business together after 1874 and left a considerable estate, but he was known for eccentricities, such as storing potted venison in the Witney church tower (Bee). However, his death marked the end of 100 years of prominent Clinch family involvement in Witney affairs.
John Williams Clinch III missed inheriting the Witney brewing business because it passed to his uncle William Clinch upon the early death of his father in 1861. At the time John Williams III was a Brewers Clerk at the brewery in Witney. In 1863, he rented the Lake Brewery in Douglas, Isle of Man, with this coming into his ownership in about 1868. The Isle of Man Clinch & Co Brewery was prominent in the latter part of the 19th century and enjoyed some success during the early half of the 20th century. However in 1945, the company and brewery were absorbed by Castletown Brewery.
In 1890, the Clinch partnership bought the Blanket Hall Brewery in Witney. In 1892, a further restructure saw the business begin trading as Clinch and Co, with an initial share capital of 4000 £10 shares divided equally between Foreshew and Somerville. Foreshew died in 1927 during a period of financial uncertainty and profit warnings brought about due to agricultural readjustments in the post World War I years. He was succeeded by his son Thomas William Clinch Foreshew.