It may be worth borrowing a freeview box from a friend and trying it. We live in an area where you can't get freeview but when I borrowed my mate's box, I was able to get quite a few of the channels just not all of them.
Do as the second answer suggests first. I live in an area where it is said we cannot receive freeview, but was tipped off that ASDA have a 28 day full refund for electrical items. So I bought a freeview box from them for about �30, handled it and plugged it in with kid gloves so that I could return for a full refund if it did not work, and found that it works perfectly and that we receive all channels.