Another good point - 'impressive', I suppose (if 'correct' deserves such an acolade!). I suppose that could be because the socket on the other side will take things other than a BS1363 plug, even if there weren't a second outlet. Indeed, on reflection, maybe that's the more likely answer - that it's simply a 'travel adaptor with just a single outlet, but taht outlet will take a variety of plugs (none of which, other than BS1363 ones, will have fuses).The adaptor the OP has does appears to be fused, at least I presume that red thing is a fuse carrier.
Kind Regards, John