Your UK PPL should contain a statement about English language proficiency ICAO level 6, dated XXX. Otherwise there could be trouble when flying outside of the UK.
Without this entry, Germans aren't even allowed to fly to Austria although the only official language there is German. So don't be surprised if they ground you in Ireland and confiscate your plane
The ICAO language test is one of the most stupid things I've seen lately. At least in Germany, it was very hard to find someone that was accredited to do the exam and pretty much impossible to get to more than level 4 without having to travel hundreds of kilometers.
When you fly to France and want to land at an aerodrome where there is no tower or outside business hours, usually the official unicom language is French. Legally, one would have to get a ICAO language proficiency entry for French as well.