EU customer, goods supplied from UK to UK as goods are for vehicle in UK

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Hi, new here so apologies if this is wrong place to ask.

We have a customer who resides in Netherlands. His vehicle is being stored with us in the UK. All parts (goods) and labour (services) are delivered/ carried out in the UK. In Sage Business Cloud Accounting, his billing address is set to Netherlands, so Sage automatically zeroes the VAT. However, if the goods and services all remain within the UK, surely we have to charge UK VAT on his invoices?

My questions are, is the above correct? And how do I keep his billing address in Netherlands but still apply VAT to his invoices?

Thanks in advance for advice regarding above.