Argh - I can't even butter my bread now without thinking about BB! LOL.

Decided to look it up myself.. and found this on the Fed Up With Food Additives site

butter ? use pure butter (ingredients: cream, water, salt). For easy spread butter use Mainland Butter Soft. Avoid butter with vegetable oils (sorbates 200-203, unlisted antioxidants, flavour enhancers). Devondale Lite contains flavour enhancer 635.

In South Africa: Woolworths Ayrshire range of butter is annatto free, but their brick butter contains unlisted annatto (160b).

margarine ? avoid all margarines except Nuttelex (see below) because of the addition of sorbates (200-203) and other additives. Liddells make a lactose free butter and sunflower oil dairy blend that doesn?t contain antioxidants or preservative.
Link: Product updates

It's frightening how additives can go unlisted!! eek!