CLI just provide letters for use by foreign creditors and CLI post them out. Any money paid goes directly to the foreign creditor thinks they are owed the amount.

If this was so important, why wait so long ?

You could ignore, as the Italian organisation is very unlikely to try to enforce in the UK. Or write back saying that you no clue about this, as you have not visited Italy for a very long time. And say no more.

Just found this on Wiki. I paraphrase slightly but it says; There is also another statute of limitations, limiting the time for enforcing a penalty, to a period of time provided for by law: five years, when dealing with misdemeanours. I think after five years these sorts of thing become public record and chancers like Cli try it on. I think you're totally safe to ignore them.