"New and existing BT Total Broadband customers are being given free access to the operators BT Digital Vault backup service. Users will receive 5GB storage with Auto Backup for their precious files and photos, more than doubling the previous offer"
It's advertised as storage space for backups etc, not as a web hosting service. I also found it easy to use and installed the autobackup feature. Bit slow in backing up but that's due to the usual BT issues.
It's advertised as a place to backup your data. It does not say anywhere that it can be used for web hosting. Its job is to backup your important data - it does this well and it does it free.