I usually buy the cheaper Lenovo E-class, but I just went and explored the Lenovo T570. I maxed out almost everything, including giving it a Core i7-7600U, 16 GB of RAM, jumbo 72Wh battery that supposedly gives 27 hours of battery life), Geforce GTX 940M, 512 GB PCIe NVMe SSD, you name it, and it came out to $2,055.60, which is about 1574.59 British pounds. So that's right around your price range.
And it's milspec. To quote Lenovo, "Tested for Battle, Built for Success. Every ThinkPad laptop undergoes 12 stringent military tests and over 200 quality checks. So, you can rest easy knowing that your T570 is more than capable of surviving the bumps and bruises of everyday life."
So try that out, see what you think. http://www3.lenovo.com/us/en/laptops/th ... 2TP2TT5700
I also just configured an E570, maxing out everything there. It doesn't have all the same options as the T570, but it has a lot of them. (For example, you can't get the humongous battery on the E570, and the E570 isn't milspec.) The maxed-out E570 came out to $1,034.10 or 790.47 British pounds.