NUS and NHS discount on iPad

Apple’s education discounts are posted on their web site - https://www.apple.com/uk/shop/campaigns/education-pricing. Other than those, the only education discounts would be through your specific school or college - many colleges do negotiate special package offers which can be purchased through the school (e.g. I know of some schools here in the USA in the past that have negotiated discounted MacBook packages with special four year AppleCare coverage).

You should ask Apple directly about any educational or corporate/business discounts to which you may be entitled or that may apply to you - as they vary.

A telephone call to your in-country Apple Sales department will likely get you in-touch with the relevant team to answer any questions you may have - and clarify the method by which you can prove any discount entitlement to which you may be eligable.

In-store staff, might be able the confirm if specific association to a businesses qualifies you for a discount, but this will be a binary response to a question.

Generally, if you have a discount entilement, this will already be known to you through your organisation/business affiliation.