The Spice Girls said they were "excited, humbled and proud" to be at the musical inspired by their music Viva Forever!
The singers also praised the writer Jennifer Saunders as well as the cast of the musical.
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Ukip's ruling committee unanimously backed a vote of no confidence in Mr Bolton on Sunday and six key party figures have also resigned.
A much improved day across the UK. Rain spreads in through this evening and overnight with the heaviest bursts across western Scotland.
Risk of localised flooding across some western areas with snow melt/heavy rain.