Vermilion & Cinnabar, the Manchester-based Thai and Indian restaurant, has unveiled plans for a £3m extension to create a new banqueting suite. The Seamark owned venture already caters for 2,000 diners a week. Now Seamark plans to invest further because it says there is huge unmet demand for a large banqueting hall in the city to host lavish weddings. Manzur Ahmed, son of Seamark founder Iqbal Ahmed, is heading the Vermilion & Cinnabar operation and has enlisted Portuguese designer Miguel Cancio Martins for the new venture. Seamark is a £125m-plus global business importing, processing and exporting foods as well as operating a cash and carry operation supplying the catering trade.