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https://www.dell.com/en-uk/shop/dell-advantage/cp/students
Below is a rough guide to the spec for laptop models & the cost without any discount:
Medium Size, good for Office & Internet - £280
https://www.dell.com/en-uk/shop/laptops/new-inspiron-14-3000/spd/inspiron-14-3480-laptop/cn38404
Small Size, higher spec(e.g. Engineering, Comp ICT, Graphics) - £790
https://www.dell.com/en-uk/shop/laptops/inspiron-13-5000/spd/inspiron-13-5391-wifi-laptop/cn59106
Large Size, higher spec (e.g. Engineering, Comp ICT, Graphics) - £699
https://www.dell.com/en-uk/shop/laptops/new-inspiron-15-5000/spd/inspiron-15-5501-laptop/cn55106