Pattern 861 Spode bone china Bute shape Tea Cup & Saucer decorated with pretty puce coloured flowers in a simple stylised three petal form together with an undulating swathe of gilt leaves. I have no idea what, if any, flower variety these could be. It reminds me of Ranunculus aquatilis flowing around the saucer, an experience, similar to gazing into a Chinese Fish Bowl. This pattern was introduced at Spode c1805. Their earlier patterns 857 & 858 were the same design with red & pink flowers respectively.
There is a black & white photograph of a suite of Old Oval tea ware in Spode's pattern 857 on page 54 of Robert Copeland's book, 'Spode & Copeland Marks & other relevant intelligence' 2nd edition 1997.
This cup & saucer is in very good condition but you can still see some wear to the gilding on the saucer which is very common during this period because the base of Spode's cups could have slight rough areas which damaged the saucers as the cup moved around. Note the lack of well for the cup to sit in, this innovative improvement didn't occur until c1825-6 for tea & coffee wares.
Josiah Spode II was justifiably proud of his (& his father's) ceramic developments which enabled him to leave large areas undecorated to show off the beauty of his wonderfully pure white bone china. He was the first British manufacturer to achieve this but even so you can usually see a few tiny speckles in the china at this early stage (several are showing on this side of the cup).
Wikipedia: Josiah Spode I is often credited with developing, around 1790, (more accurately 1796/7) the formula for fine bone china that was generally adopted by the industry. His son, Josiah Spode II, was certainly responsible for the successful marketing of English bone china.
There are no manufacturer's or decorator's marks on these pieces. Consistent pattern number marks at this stage were only found on the main pieces of a Tea Service ie. the Teapot, Sugar Box, Milk Jug, Slop Bowl & Bread and Butter Plates (saucer dishes).