Importing (immatriculation) of the bike in Holland should not be very expensive if we are talking about a used bike on UK plates - just BPM.
As you don't say what bike it is nothing more can be said.
IF you had applied for a tax exemption when moving into Holland and you'd meet the requirements you'd be paying nothing.
I suggest you sell the bike in the UK and get another one on Dutch plates. Easiest solution.
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Overlanding & Customs Paperwork Specialist
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