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Below is a rough guide to the spec for laptop models & the cost without any discount:
Medium SizeSmall Size, rugged (good for children), good for Office & Internet - £280£450
https://www.dell.com/en-uk/shop/laptops/new-inspiron-14-3000laptop-computers-2-in-1-pcs/latitude-3310/spd/inspironlatitude-1413-34803310-laptop/cn38404n003l331013emea
Small Size, higher standard spec(e.g. not Engineering, Comp ICT, Graphics) - £790£560
https://www.dell.com/en-uk/shop/laptopslaptop-computers-2-in-1-pcs/inspiron-13-500014/spd/inspiron-1314-5391-wifi5425-laptop/cn59106cn54402sc
Large Size, higher spec (e.g. Engineering, Comp ICT, Graphics) - £699£900
https://www.dell.com/en-uk/shop/laptops/new-inspiron-15-5000laptop-computers-2-in-1-pcs/inspiron-14-5420/spd/inspiron-1514-55015420-laptop/cn55106cn54609sc