Is it possible that you went into the settings and changed the password to something memorable in the past?
Below taken from tinterweb
You can connect to your Home Hub to check status and alter settings via your PC's web browser - Go to
http://bthomehub.home/. Once you've logged in to the BT Home Hub, you need to go to the 'Advanced' section. Here, you'll find the following sections:
Configuration: Contains the following:
Wireless - Set up the Hub's wireless settings : SSID , speed, channel, encryption (WEP, WPA-PSK or WPA)
Telephony - BT Broadband Talk settings
Internet - Info on your Internet connectivity. This includes your username and password - note that be default this is "
[email protected]" (with no password) - these details aren't actually needed as authentication is done using your phone number
IP Addresses - Here you can enable/disable DHCP, define a DHCP pool, and set the Hub's IP addresses and subnet mask.
Devices - Shows the status of connected devices
Application sharing - Allows you to assign port mappings (translation of incoming packets for a port range, to a local port range). More
Firewall - Allows you to select levels of protection. More
Dynamic DNS - Allows you to use a service such as DYNDNS so that machines outside your network can get your IP address
System: Allows a reset, restart, and the option to set the Home Hub to get the time automatically (Enter up to 5 NTP servers). Also has the 'Remote assistance option to allow BT Support to connect in