Great Britain's women and men both won bronze in the 4x400m relays as the team ended the World Athletics Championships with seven medals.
Christine Ohuruogu, Annika Onuora, Eilidh Child and Seren Bundy-Davies finished third behind Jamaica and USA.
And Martyn Rooney produced a great last leg in the men's race as Great Britain took third from Jamaica by four thousandths of a second.
USA won gold with Trinidad and Tobago taking silver.
Great Britain's quartet of Rabah Yousif, Delanno Williams, Jarryd Dunn and Rooney looked set for a fourth place finish after Jamaica's Javon Francis took the lead on the final lap, but Rooney remained calm and pipped him at the line.
Earlier, the women produced a superb performance to comfortably win bronze.
Seren Bundy-Davies anchored the team home to a season's-best time of three minutes 23.62 seconds.