Hi Myrm!
Hmmm... really odd!
I've popped that postcode into our search tool and it appears that there is only fringe GPRS coverage at that location - certainly not enough for 80% 3G. Can you perform a hard reset on your BlackBerry? I'm not sure that the speed you'll be getting in this location will match what it's saying.
Other than this, have you tried swapping the SIMs over? Any difference?
Beyond this, it could be a fault with the modem or there's abnormal electromagnetic interference coming from your laptop. In the case of the former, we do offer a repair, and in the latter, this can happen in rare cases where the modem stick does not fully protrude from a computer's electromagnetic field. This is not common, but indicates a fault with the computer's hardware - can you try an extension cable to lengthen the distance at which the modem sits from the computer body?
I think we do need to know more about this whole situation before we could conclude what's going on. Also, can you take use the modem SIM in your BlackBerry and connect via cable or bluetooth? How does that work for you?
Let us know!
Daz
eForum Team