I've had friends buy laptops from Novatech (
https://www.novatech.co.uk/laptop) before and no complaints from them were really happy with my recommendations.
Never bought laptops myself as I either got them for free at work or hand me downs, my components I have bought mostly from Novatech and their CS is brilliant
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also at work we use dell laptops and a few of their service engineers have mentioned that they have been visiting a lot of customers recently with alienware laptops for all kind of weird and wonderful hardware faults.