I helped the GK's make this today with a few tweaks due to the mysterious disappearance of my white chocolate and oreo cookies from my pantry.
I used 160g of Cadbury milk chocolate melts as that's all that I had and used 8 TimTams and a splash of vanilla essence.
They were delicious although I do prefer the cookies and cream original recipe but the kids preferred this as they love TimTams. ( as well as the fact that they were allowed to put the ingredients into the bowl and spread the mix in the tray)
Worth a try if you like fudge and TimTams