I used the 0207 no. as the 0845 is expensive on mobiles. I'm not sure what access no. gives you the 400 minutes? Guess it could have been the 0845 on a land-line? Maybe I had less minutes as I phoned on my mobile, but I couldn't see anywhere where it said less minutes if you phone on a mobile. When I phoned, I could have actually used the landline (when most times I need to use a mobile), but just thought it was easier speaking when not attached to a cable!
I'll give them a call later and see what I can find out. They seemed very nice when I called last week.