According to the Defra website, "The Advisory Committee on Organic Standards (ACOS) is a non-executive non departmental public body which advises government on organic standards, approval of organic certifying bodies and R&D. It was preceded by UKROFS."

What a mouthful - fortunately, organic sounds, looks and tastes better.

Anyway the list of approved UK certification bodies is quite long so we won't repeat it, but you can find it here.