I think I'd probably cope with it including irrelevant and mislabelled stuff and the inevitable tons of Alibaba crap if it (.co.uk) didn't fail so hard at pagination that most of the results were inaccessible. Feels like some marketing bod has wargamed the "bust if we fix this people buy cheaper variants of the same product and don't check the Prime box" scenario and decided that as they're Amazon and people will use them regardless, broken search results are better than functional search results