I use Simply Sensitive or Pure because it is highly concentrated and optical brightener free. I use it for underwear, towels and bedding. Is available in Tesco's and Sainsburys UK.
Ariel or Persil colour care liquid and liquitabs respectively.
Interestingly, Ariel and Persil colour care powders do contain OBs, however, Ariel colour&style excel gel and Persil colour care capsules don't list OBs in the formulation.