Dell Refurbished Outlet are offering 40% discount on all their Refurbished Laptops when you use the code BOXINGDAY40.
Many of the laptops there are only 2-3 in-stock.
However the one I have posted here has 20+ in stock and seems great value when you factor in the specs.
The prices shown on the website do not include the discounted price with the discount code, so you will only see the final price at the checkout. Also factor in there is a £6 delivery charge.
The Dell Precision 5540 Laptop shows as £609, but with the code applied it brings it down to £321.68.