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As per the screenshots, in the PARTS thumbnail, the wing is shown at £16.99. When clicking on the thumbnail and viewing more details, the price jumps to £21.08! (I have seen this elsewhere on HK. This is very dishonest.)
The thumbnails show the Global warehouse prices.
Then on the actual product page, you get the relevant regional warehouse price that you see - yours being the EU warehouse. VAT somewhere in the mix causes the difference.