chocolate chips

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Hi there!
I stumbled upon an interesting recipe for low carb peanut butter cookies (btw here it is http://www.the-lowcarb-diet.com/2013/05/peanut-butter-surprise-cookies.html) but then I realised I have no idea where to get sugar free chocolate chips in the UK. Does anyone know of the lowest carb solid chocolate around? What would you suggest to use for this?

Cheers!

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