There would appear to be an increase in the number of foreign coins in circulation in this area.
Since Xmas I have been given three in my change.
1 marked 50 KURUS (TURKIYE). Bi-metal, slightly bigger than 1 euro.
1 marked 10
(possibly Eastern bloc) Bi-metal, identical to 2 euro.
1 marked 1 KR (SVERIGE). Nickel, slightly smaller than 2 euro.
Please have a close look at your change.
By not checking I am now 5 euro or ?5 out of pocket !!