Data Safety and Encryption

Hi
I'm not sure if this question has been asked before and I couldn't find an answer when I looked.
In the light of recent news about hacking of data (eg; Talktalk), do we know if the user, customer, and supplier personal data stored on the Quickfile servers is encrypted. If the servers were ever attacked, albeit unlikely, would this data be safe?
I have a registration with the Data Protection Agency, and I am required to keep my customer's data secure, but these are now passed on to Quickfile, and I need to be able to reassure myself and DPA (if I'm ever asked), that there is not a weakness here.
Regards, Richard Flower