Yes, Purdey's supplied plenty of trios (brace implies two). Many of European aristocracy were able to afford such "toys." Also, many of the rising merchant class could afford them, but often opted for other makers. Note that Brits of that time were quite sensitive to where and from whom they bought luxury goods -gunmakers, as well as most bespoke makers of best goods, tended to be patronized by specific social circles.

A person in a social circle that shot would have had a long list of other "required" items to buy before he got to the guns.

Post the serial and we will date it for you; Purdey serials are well known. Purdey's has historically been a bit sensitive about revealing the original customer. Looks to be a nice gun.