when I’ve ordered in the past the bikeinn price has included all duties. I think they have a UK distribution arm so anything you order is shipped to there by the company and then on to you as if you’d bought from the UK.
from their FAQs
https://www.tradeinn.com/bikeinn/en/centro_soporte/st#envio-de-mi-pedido
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<p class=”txt-devoluciones”>When will I be charged VAT?</p>
<p class=”txt-dev-respuesta”>- For orders being shipped to countries within the European Union, VAT is already included in the product prices you see on our website.
– For orders being shipped to countries out of the European Union, no VAT and no sales tax will be included in the product prices you see on our website and you will not be charged any taxes by us. However your packages may be subject to the customs fees and import duties of the country to which you have your order shipped. The courier will charge you any taxes or customs directly. As taxes and customs may also depend on product category as well as declared amount, we are not able to provide you with any further details. We would recommend you to consult your local Customs office, which will happily assist you with further information.
For the United Kingdom, the price on our website will be the final cost to you. There will be no additional VAT or duty charges requested on delivery by our carriers.</p>
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<p class=”txt-devoluciones”>Will I be asked to pay additional VAT or duty charges upon receiving my parcel in the United Kingdom?</p>
<p class=”txt-dev-respuesta”>No, the price on our website will be the final cost to you. There will be no additional VAT or duty charges requested on delivery by our carriers. We have done all we can to prepare for Brexit in the best way possible to offer the best experience for the customer.</p>
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