I used to love these when I was small. I always thought of them as Nestles Dairy Crunch (pronounced "nessles" as it was in those days). I have never had the white one but some months ago (probably about a year or more actually) I tried one of the old bars and it was revolting. It tasted like cheap cooking chocolate shot with bubble wrap.
What a shame they have to mess around with old recipes and spoil them. Toffee Crisp has never been the same since Nestles got their hands on them.