the cost is so variable, you couldnt supply an accurate guess - £50-£500. It depends on the size, volume, locations etc.
If it is a small consignment - 10-20kgs, get it sent by Royal Mail. If a pallet, speak to to some local companies and ask for a backload, which should reduce costs..
As for VAT, you will be charged the UK rate and, if you are Dutch tax registered, you can claim it back at may even be able to be charged ex tax (not sure on tax rules on inter Europe shipments). The UK rate is 17.5%
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