The Team GB 4x400m relay share an embrace after sealing silver
Perri Shakes-Drayton had run the third leg in the heats yesterday but Doyle replaced her to strengthen the team and it paid dividends.
The US team were 1/10 favourites to take gold and duly delivered with Phyllis Francis running the anchor leg with the chasing pack some 50 metres behind.
Doyle handed the baton over to Emily Diamond with a lead of a few metres over the Polish team but the Brits were confident of ensuring Justyna Swiety did not get past.
And so it proved, and although Diamond tied up in the 100m, Swiety ended up four tenths behind the British quartet who sealed a silver that looked even more certain when Anneisha McLaughlin-Whilby pulled up to end Jamaica’s bid after just 400m.
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8th: $4,000 (Individual) $4,000 (Relay)
In the men's race, the Americans were also favoured but were by no means expected to win in the same way as their female counterparts.
They led from the start while Matthew Hudson-Smith, who replaced Jack Green in the team and was given the lead-off leg.
GB had been beaten by Belgium in the heats after a poor anchor leg from Martyn Rooney but found themselves in an almighty scrap with Trinidad & Tobago for silver.
Team GB's men's 4x400m relay team celebrate a bronze medal
Dwayne Cowan ran down Jereem Richards in the closing metres to ensure the home team were level for second at the halfway stage but Rabah Yousif was unable to get them clear and left Rooney with more to do in the final 400m than he was capable of doing while the Tobagan team ran down Fred Kerley to take a surprise gold.
The relay double somewhat saved the championships for Team GB, who before the weekend had just Mo Farah's 10,000m gold to count.
But he added a 5,000m silver before the women's 4x100m took silver and the men a shock gold ahead of the double 4x400m success in the traditional closing event.