Kammala jumla mai zuwa: A ranar 17 ga Afrilu, 2021, Team GB da British Swimming sun sanar da wasu masu iyo 24 za su shiga cikin tawagar, wanda ya kunshi duk masu iyo da suka hadu da lokacin la'akari da wasannin Olympics a kowane taron a Gwajin Kasa, da kuma wasu masu iyo biyu da suka hadu da lokacin la'akari a tseren mita 200 na maza, kuma don haka an yi la'akari da su ga tawagar 'yan wasa 4 × 200 na maza. Bayan Gasar Wasannin Ruwa ta Turai ta 2021. da Glasgow Open Swimming Meet, an kara wasu 'yan wasa biyu, Lucy Hope da Laura Stephens, a cikin tawagar karshe na talatin. Saboda yiwuwar rikice-rikice na tsarawa, Birtaniya ta mayar da wani wuri a cikin kwata-kwata.
Mata 'yanci relay, wanda aka sa'an nan kuma tura zuwa Brazil.