Would probably have to make that sacrifice to strictly fit it into the £400 budget... or sneak it past the wife somehow
C is a proper NVME drive using PCIe and B is a SATA drive. C has 50TBW more than B.Go for this, faster and has twice the write endurance!
£18 quid more will get you the same but 480gb from cclonline I don't know much about nvme's, but i've been looking at the adata sx8200 pro as looking as good value, thats about 41 quid for 256gb (£78 for the 512) (what reviews i've seen it seems decent)
Looking at the datasheet, those one have TBW of 160(256GB), 320TBW(512GB), 640TBW(1TB), so the Corsair I link too is still a lot better for about the same price! Edit, just saw you initially linked to the larger version of the Corsair drive I was referring to the Adata one you linked to Those Corsair drives are fantastic for the price!