My quest to find the best wireless roaming agreement has now led me to Ipass. It’s just signed an agreement with BT Openzone to allow Ipass subscribers access to BT’s 1500 hotspots. To the players I’m aware of right now are..

Boingo – Worldwide.

BT – UK

Ipass – Worldwide.

T-Mobile – US & UK. (Worldwide?)

So I’m going to keep searching for a provider that gives the cheapest subscription rate and the largest geographic coverage, so that I only really need one subscription.