Hey, I did mention go-mo above.
TalkTalk had 1GB of roaming data included in the offer I mentioned. I got their plan for 9 CHF/month without included calls though. Domestic calls are only 0.10/min and it also includes 1GB of roaming data/month - which is much more important to me. My calling minutes will be minimal (less than the 2 CHF difference).
It was a time-limited offer though, unlike go-mo (de facto, 50’000 users or not)