[Studio25]

If on average you watch a couple of 200 MB programs a day, and use 50 MB on "other stuff" - that would exactly yield the sort of usage pattern they describe. If that's way in excess of what you watch - it's possible someone else is using your wireless. By default BT wireless routers have an enabled channel through which other BT subscribers can use WiFi when they are on the move. You can (and should) switch this off, but although the cynic inside me is saying "yeah, right", I'm sure that BT will separate your own usage from public usage for the purpose of calculating whether you're near your limit.

BT's old silver 2line router has both WEP and WPA enabled. WEP is easily hacked, so assuming they still enable both protocols, someone could be using that WiFi channel and stealing your broadband. I never found a way to switch off the WEP channel.