RHS GARDEN Rosemoor celebrates its 21st birthday this summer by hosting the finale of the RHS/Renault competition to win the keys to a Renault Grand Modus.

The competition began at Rosemoor on June 19 and the winner will have successfully completed a treasure trail at one of the four RHS gardens over the summer. The winner's namer will be announced at Rosemoor this Saturday, August 27.

The Renault Grand Modus — awarded 'best small MPV' in green car awards for three years running — will be driven away by the winner after a series of elimination rounds.