Which west end musical was inspired by the wizard od oz?

The West End musical inspired by The Wizard of Oz is Wicked.

While not a direct adaptation, Wicked tells the untold story of the witches of Oz, specifically Elphaba (the Wicked Witch of the West) and Glinda (the Good Witch of the North), before Dorothy arrives. It explores their friendship, rivalry, and the events that led to their destinies.