Most types of blood tests done, including quantitative viral load tests. They use reputable labs, which are listed.
Testing kit is sent in the post, you have to get the red stuff extracted, then return the sample in the package provided.
Thanks to Wilko for finding this.
Finished Greg's Indian Sovaldi and Mesochem Daclatasvir generics on 23/11/2015 Virus undetected after 2 weeks of treatment. Virus still undetected 20 weeks post-treatment (SVR20). Officially declared cured and signed off by the NHS!