I’ve not used slrhut and I don’t think I would. My opinions are probably useless to you but I’ll epxress them any way
I wouldn’t be confident that a DSLR body will be problem free. Nikon are a PITA over parts so I think a warranty is quite helpful.
Its £629 on Digitalrev. My brother in law bought lenses from them. Apparently Nikon lenses are intentionally warrantied where bodies have regional warranties.So if you buy from didgitalrev then then you are relying on them for the warranty but from what I’ve read they do offer good customer care
If it seems to good to be true then it probably is