I've been researching probiotics in the UK for almost 2 years now. And I think I've found the best one out there.
It is called Bio-kult - its made (and currently only available) in the UK. Designed by a scientifically minded couple who were trying to treat their autistic child it comes highly recommended by my nutritionist who says this is the *only* probiotic that she recommends.
You can order it direct from Bio-Kult or via nutricentre (£5 web discount for every £25 spent).