BT rolled out a firmware update not so long ago that forced every connected homehub to change the admin password to its own serial number. Try entering admin/<hubserial> as the user/pass.
The serial number is printed on the back of your hub. It looks like this:
xxxxxxxxxxx(xx)
Just use the first 11 digits as the password
If this does not work, you can find instructions to reset your hubs settings here.