For once, I agree with others

Yes you are saving a few quid, but
you do not know the postage cost ? I doubt a single unit would be shipped from China for under £50 maybe more

given its size.
Add to that, gooseneck, brush, hose and fittings and you are only saving a little over buying from a UK supplier and costing you more in piece of mind ( or lack of ) .
I've finally realised after years of diy'ing and trying to save a few quid here and there, that my time is better spent earning money rather than wasting time and leg work trying to save it. one cancels out the other.