The Houghton London Ensign Reflex Model B is a British-made single-lens reflex plate camera produced in the early twentieth century. It falls into the large-format SLR category, designed for sheet film or glass plates and aimed at serious amateur and professional users of its day.

At UK auction today, hammer prices for the Ensign Reflex Model B sit in a narrow £44–£88 band based on the limited recorded sales, with a median around £66. These are saleroom results — wholesale levels reflecting condition-sensitive demand for early British reflex plate cameras — so a clean, complete example with a working shutter and original back tends to sell for more than a shabby one.