Like many tea companies in history, James McLaren & Sons is no longer around. James McLaren & Sons were located at 42 Albany St in Edinburgh. Here is a label for James McLaren & Sons Foochong China & Darjeeling Blend. McLaren & Sons advertised themselves as blenders of grand old Chinia Teas since the reign of George III.
In the book Brief Notice of the Tea Plant, Together withe Some Account of Coffee, Sugar, Rice, Tapioca, Sago and Several of the Spices, Collected From The Shop Bills of Andrew Melrose & Co Edinburgh you can read a print ad from grocer and tea dealer Andrew Melrose Co, which was the founder of Melrose Tea.