You can find a few terms that sum up the Preston upholstery maker Tetrad: special, eccentric and British.  They don't seem to be considering churning out sofas and chairs, but are usually experimenting with some thing distinctive, but, Every so often, they think of a blinding winner: their Harris Tweed https://tetradsofas56778.mybuzzblog.com/16724711/about-tetrad-sofas