Ok, will have a look tomorrow and get back to you.
Concerning the inverse of what is expected, last weekend I went to Lisbon to visit some friends and had the week before changed my mobile to Sky/O2. Landed and no phone service, got to hotel and connected up to wifi to sort it out and went through all the Sky trouble shooting with no luck.
So I started searching the internet and the solution was to turn of roaming and reboot. Never going to work I thought but of course it did. So then to test I turned roaming back on and lost the signal. turned it off again and it worked.