[CMOTD]

I don't think it has changed recently but import/customs duties do not apply to consignments from USA below €150, except for perfume, tobacco, and alcohol products.

However, don't get customs duties mixed up with VAT which is entirely different, payable on goods over €22 and levied at each country's individual rate. You may have been charged VAT for your model car but not customs duties.

Above refers to EU not current UK situation which differs slightly.