It doesn't say the amount either, just that each item must be worth less than 20 british pence. So it can be one drop of "Aceto Balsamico Tradizionale di Moden

It doesn't say the amount either, just that each item must be worth less than 20 british pence. So it can be one drop of "Aceto Balsamico Tradizionale di Modena DOP", which is the real deal. Prices start at around 50€ for 100mL, but it can easily go into the 100s if you want the more premium ones (25 years). A single drop would fit the 20 pence bill.