Vegan White Chocolate Cheesecake (No-Bake)

For the base:

• 300 g gingernut biscuits (These are almost always accidentally vegan but be sure to double check before buying. I used McVitie's)
• 90 g vegan margarine melted

For the filling:

• 400 g cream cheese Violife brand
• 80 g icing sugar
• 180 ml whipping cream I used Elmlea double plant cream, dairy-free
• 180 g white chocolate I used The Free-From Kitchen Co, vegan; plus a little extra for topping