Computers priced from £300

Dell Precision M6600 Intel i7-2760QM 2.4GHz 16GB 480GB SSD 1TB HDD NVidia K3000M 17.3" 1920x1080p Windows 10

Excellent condition. Some wear on lid. 17.3" 1080p screen. Gaming GPU NVidia Quadro K3000M GPU. Very fast with quad core processor, 480GB SSD and 1TB HDD
Very high performance aimed at gaming, business, engineering, and graphic/media applications.