We popped into Izumi recently for the first time.
I was delighted to discover that Coeliac isn't a problem, and gluten free options are plenty. I was even shown the bottle of GF Soy Sauce they can use when required, and that they can use cornflour etc.. Very re-assuring and makes such a big difference.
The food itself was amazing, and the service was excellent. All the staff are so friendly.
Highly recommended.