You will find 3 terms that sum up the Preston upholstery maker Tetrad: special, eccentric and British.  They aren't thinking about churning out sofas and chairs, but are always experimenting with a little something diverse, but, every now and then, they think of a blinding winner: their Harris Tweed selection. https://tetradsofas67889.blogoscience.com/43133522/a-review-of-tetrad-sofas