The remaining potters create floral posies and vases, before guest judge Jo Taylor sets a surprise embellishing second challenge. Who'll bloom into the next round, and whose posy isn't all rosy?

Siobhán McSweeney hosts the semi-final, where the four remaining potters make wall-mounted water fountains inspired by Rome's Trevi Fountain and take on guest judge and ceramic artist Cleo Mussi's surprise mosaic challenge. Whose fountain will make a splash and see them through to the final, and whose mosaic will leave them picking up the pieces?