It is according to one source, “the name commonly used to refer to the collection of nineteenth and early twentieth century buildings that reside at 1 James St, Salford".*
Bits date back to the early 19th century and a cursory glance on the net reveals its rich and varied use today.
And armed with them I couldn’t resist going looking for the place when it was still relatively brand new.
So here from the 1849 OS for Manchester and Salford is the mill which in 1911 was the property of H W Lee and Company.
And that is about all I want to say. The wiki site has a nice introduction and I suggest you take a walk down there.
Pictures; the Islington Mill, 2016, from the collection of Antony Mills and in 1849 from the OS, Manchester & Salford, 1844-49, courtesy of Digital Archives Association, http://digitalarchives.co.uk/
*Islington Mill, https://en.wikipedia.org/wiki/Islington_Mill