I heard that both men's and women's 4x100 GB relay teams won silver medals. Was it close, or a large gap between them and gold?
Not particularly close. The women were 0.41 behind the Jamaican team but a good performance. The men were 0.26 behind an exceptional US team. The US team ran the 3rd fastest time of all time, only bettered by 2 Jamaican times. The UK team ran the 6th fastest time of all time, only beaten by 4 Jamaican times and the US time.
Also Japan in 3rd ran the 14th fastest time of all time. A time that has only previously been beaten by Jamaica and the US