This takes us back to Aviatrix's comments about what now happens with FR flight attendant PA, including safety briefings by non-English speaking staff. You would have thought they would have moved on to pre-recorded announcements.
The PA announcements aren't actually my main concern here - most of us probably know these by heart now.
My main concern is that these FAs would not be able to communicate with their passengers if something were to go wrong. They may all know a few basic phrases like "Duty-free, anyone?" or "Tickets for the Stansted Express?", but their actual COMMAND of the English language is almost non-existent.