Wrendale Christmas Mug & Tray Set by Royal Worcester. Our fabulous range of Wrendale Christmas Mugs & Tray Sets are perfect for your Christmas table or as a great gift for a loved one. Each Mug and Tray Set includes 2 small mugs on a matching melamine tray. Each mug measures approx. 8.5cm tall with a capacity of 0.18L or 6.5fl oz, the tray measures 21cm by 14cm.