"Messrs. Grimwade Brothers established their Winton Pottery (Stoke) in about 1886. A wide range of useful and decorative earthenware was produced."
From: Jewitts 'Ceramic Art of Great Britain 1800-1900'.
After 1900 the firm was known as Grimwade Ltd, becoming Royal Winton in 1995.
Little seems to be known about Grimwades's utilitarian items, even though they are not at all uncommon on Ebay and other auction sites. Sellers seem cagy about attributing a date to their items. In addition to the pie dish, I have seen a pie funnel, a "hygienic drainer", a jelly mould and a pudding basin, labelled "art deco" or "20s - 30s". All bear the "Grimwade Perfection" blazon pointing out their unique features with instructions for their use. There is also a Grimwade Perfection Patent "female urinal" - a bedpan.
The "Quick cooker" steamer pudding bowl is particularly ornate, as it has several features designed to improve hygiene and reduce cooking time. An internal funnel allows steam to circulate through the middle of the pudding and cook it from the inside as well as the outside. The cover is grooved to hold strings so the cover and bowl can be tied closely together. The cook is exhorted, after filling the bowl and before putting the cover on, to place a small piece of pastry or dough in the hollow around the neck of the funnel. This will form a seal once steaming commences, eliminating the need for a pudding bag. Inside the cover you find advertisements for several other products, although unsurprisingly not the bedpan. As you might guess, I want one!
The next three pictures [from an eBay auction] show the marvellous "Quick Cooker" pudding bowl.