where can i buy excellent quality castor oil in the uk?

I need it like yesterday!

My mother took too much MSM and her knee has gone into a very severe pain and inflammatory response, plus it didn't help that she used a massager on it, which for some reason its made things much worse.

She cannot bend the knee at all, she will only do the doctor thing as a totally last resort!!!

greatful for an early response.

ajd24