I have recently discovered that our forms are accessible in an unsecure format

Hi, 
Ive recently discovered that our forms are accessible in an unsecure format:

the form https://form.jotformeu.com/InnovateEducation/dlp-part-time is also accessible here http:form.jotformeu.com/InnovateEducation/dlp-part-time and its not redirecting to the secure form. 

Yes, both link will work but when you send the unsecured form it will automatically turn into secured form. Please check my screencast:

You can also check this blog post: https://www.jotform.com/blog/secure-free-accounts/

You might be interested in the Encryption Form Data. Please check and read this guide: https://www.jotform.com/help/344-Encrypted-Forms-and-How-to-Use-Them