Aviation IR English validity
Aviation IR English and so-called aviation IFR communication exams conducted in accordance with EASA FCL.055(d) requirements have lifetime validity. In most countries, you do not have to revalidate nor renew it.
In most of the EASA countries upon successful completion of the exam, IFR English language proficiency does not have to be revalidated or renewed. It is endorsed together with the Instrument rating (IR qualification).
France - IR English exemption
Only exemption is currently France. French authorities requiring demonstrating of IR English during each language proficiency exam. Thus IR English privileges are valid together with your ICAO English language proficiency.