Slice tin: line a square tin (24cm x 5cm, 9" x 2") with baking/parchment paper, leaving a 1-2cm overhang on all 4 sides (Note 5).
Chocolate fudge: add the chocolate, sweetened condensed milk and butter to a large heat proof jug. Place this into the microwave and use high heat for 2 minutes. Then remove, set on a heatproof surface and stir. Next return the fudge to the microwave for a further minute on high. Once the microwave beeps off, remove the fudge,, set it back on the heatproof surface and stir again.
Combine: tip the chopped pieces of cherry ripe into the combined fudge. Stir gently to fold them in.
Transfer: pour the wet cherry ripe fudge mixture into the prepared slice tin, Then tap the tin gently on the bench (to remove any bubbles). Note 6
Set: place the fudge into the fridge to set. Minimum 1-2 hours or overnight.
To serve: remove the fudge from the fridge. Use the overhang to lift it up and out of the tin. Then discard the 2 sheets of baking paper. Use a sharp knife and cutting board to slice the large square into 4 even squares, then chop each of those squares into 9 smaller pieces.