Thank you for suggesting the prebiotic. We would be very interested to try it here and explore the effectiveness compare to microbiota transplant, but unfortunately they don’t ship outside the USA yet. I wonder if there are any kind people in the US who would be willing to purchase it and send it to the UK? 
I of course would pay in advance for the product, delivery and the kind person’s time. I am also happy to accept the fact that due to the nature of the product there is a chance it might get stuck in customs, so it will be a bit of the lottery whether the product arrives or not