The UK Museum Libraries and Archives Council has a downloadable booklet, Guidance to exporters of antiquities (including numismatic items), which says that Article 2(2) of the EC Regulation on the export of cultural goods (Number EEC 3911/92) allows member states to exclude objects of limited archaeological importance. It goes on to say:
5. The UK has decided to exercise its discretion under Article 2(2) by excluding the following categories of archaeological objects as being of limited archaeological or scientific interest:... with some additional rules about being lawfully on the market, etc.
(a) numismatic items of a standard type which are published in a reference work on numismatics;
(b) objects, other than numismatic items, which possess no special or rare features of form, size, material, decoration, inscription or iconography and which are not in an especially fine condition for the type of object.
Thus nearly all ancient coins don't fall under the strict rules suggested by the EU regulation.