I Couldn't resist buying this 9 piece trinket set made by Myott Son & Co. Its missing its original tray unfortunately as I'm sure it would have had one. The mark dates it from 1907 to 1920 as far as I can tell. The set consists of a pair of candle holders, one large lidded powder bowl and two smaller ones, a small trinket tray, ring holder and what looks like a pot pourri lidded bowl and either a hat pin holder or something used as a talcum powder shaker(?).
Its marked "Imperial Semi Porcelain" on the base, but I'm not sure if the "Imperial" refers to the pattern or to the semi-porcelain. In any case, I've not been able to as yet identify the pattern name. There is a Myott website but there is a fee for joining, so I'll persevere for a while longer to see if I can track it down.
I wasn't familiar with the term semi-porcelain, but it appears that this resembles or imitates porcelain and is a relatively hard glazed white earthenware commonly used for tableware. It does have a nice blueish tinge to it in the way that real porcelain does. Apparently semi-porcelain was first used in 1880.