Look at purpose. If you had not got the contract you would not be collecting the data. You have no purpose of your own. This really should be set up as a DC - DP agreement, in which case of course they are entitled to it - they are the DC.
The real world may have added complications but the principle is relatively clear.
All archives of messages are stored permanently and are
available to the world wide web community at large at
If you wish to leave this list please send the command
leave data-protection to [log in to unmask]
All user commands can be found at https://www.jiscmail.ac.uk/help/subscribers/subscribercommands.html
Any queries about sending or receiving messages please send to the list owner
[log in to unmask]
Full help Desk - please email [log in to unmask] describing your needs
To receive these emails in HTML format send the command:
SET data-protection HTML to [log in to unmask]
(all commands go to [log in to unmask] not the list please)