"Bladeless? That is surely a contravention of the Trade Description Act."
Yes, a major company and inventor has somehow failed to take account of this 1968 statute.
Or!!!
Maybe the Trade Descriptions Act was worded to ensure that 'each product sold must be as described, of satisfactory quality, and fit for purpose as described'.
'As described' doesn't mean that its design (and the words to describe thereof) must match any previous or future equivalent product. It seems to me that usage of the word 'bladeless' doesn't mean that it must conform to any possible definition of a fan blade, only that it conforms to the kind of blades found in the type of desktop fan currently found in most households and offices.
cf. 'smear-free window cleaner'...
'high-mileage engine'...
'a website promoting intelligent debate and discussion'...