Lightly butter a cheesecake tin. Whizz the digestives in a food processor until they resemble breadcrumbs. Pour in the butter, whizz briefly again, then blend in the ginger biscuits (make sure you taste the mix as depending on which ginger biscuits you have you may need some more butter). Then tip the mixture into the tin and press down firmly, cover with clean film and leave in the fridge.
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