Fill a large pitcher about halfway with ice.
Add the thinly sliced cucumber, thinly sliced orange, and halved strawberries to the pitcher.
Pour in the Pimms No. 1 Cup.
Top with the lemon-lime soda and gently stir to combine without losing the fizz.
Tuck in the mint sprigs for aroma and freshness.
Serve immediately in tall glasses, making sure each glass gets a good mix of fruit. Keep chilled on ice if serving a crowd.