Just to say thanks for the help on this.
In the end my friend chose the Lenovo IdeaPad 310-15ISK Laptop, Intel Core i3, 4GB, 1TB, 15.6”:
https://www.johnlewis.com/lenovo-ideapad-310-15isk-laptop-intel-core-i3-4gb-1tb-15-6-silver/p3356842
Basically they have around £300 of John Lewis vouchers...