In the US – Honestly, we're not even sure that you really need to be a student to use the Dell US student discounts, as when we followed the process of adding a student-priced monitor to our cart on the website, we could still proceed to checkout as a guest without any prompting for validation or sign-in using academic email accounts.
In the UK – If you are a student or apprentice aged 16 years or older, and studying at a college or university level then you are eligible for a Dell student discount, however, you will need access to an academic email address (usually ending in ac.uk) and Dell seems to be pretty strict on it.
If you don't have an academic email address, then you can contact: dell_advantage_student@dell.com with proof of your enrollment into your college or university instead. You might also be required to submit a photo of your current and in-date student ID to Dell as evidence.