I bought some crabon wheels for the Brompton (yeah,
, I know) from a Chinese supplier.
They arrived tagged as a 'gift'.
It isn't the only time I've received stuff from China tagged as a gift.
Conversely, when I bought a light from Dinotte (USA) I was hit for tax, as well as Royal Mail's handling charge.
ETA - I'd be surprised, unless there was a regular flow of consignments, that anyone from the authorities would check on this.