I do not know what import duties or VAT you might have to pay. I do know it is rare for UK customs to ask for payment. Most shipments just go through without any duty or tax.
In almost 25 years of shipping, we have only had one shipment taken by another country's customs. That country was Israel. The coin was a common, ordinary coin ancient coin. I do not remember exactly what type but it was not a type from Israel. I still do not know why they took it. We have shipped to Israel many times both before and since.