Place the mint leaves, rasberrys, lime wedges and strawberrys (sliced in half) into a cocktail shaker. Add a splash of sugar syrup and muddle well. Add the pimms and rasberry vodka. Prepare enough crushed ice to fill the highball glass to just over half way. Add 5/6 ice cubes to the shaker and shake well. Add the crushed ice to the glass and then strain the contents of the shaker over the crushed ice. Top up with soda. Add two straws and garnish with Strawberry/Lime Wheel/Mint Sprig or all three.