Whats the best London venue for cupcake making classes or cupcake decorating classes for a hen party?

I am looking for a London venue for cupcake making classes or cupcake decorating classes for a hen party. The emphasis is on fun - nothing too serious. Would be goood to combine with maybe cocktails lessons, champagne or afternoon tea (so the hen party can eat them not lug them around London).
Update: Party is for 10-15 girls and is a classy hen party no L plates!
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