Here's the £850 one - does have a TB SSD but still...
https://www.ebay.co.uk/itm/apple-macbook-pro-retina-15-4-Inc...
And the £620 with 256GB https://www.ebay.co.uk/itm/Apple-Macbook-Pro-15-inch-mid-201...
That is some serious value being retained right there.