I have to correct myself.
I wrongly stated that I paid not VAT because I assumed 22% VAT is 22£ so when I only had to pay to the mail-lady 4,55€ I assumed it was only service fee.
But after @willmm1 message I checked the package again and I saw that the value of the goods was stated at £10 so…
22% VAT of 10£ = 2.2£ → 2.55€ + 2€ service fee = 4.55€