Fleurpepper
And of course, in care homes, many carers have very strong non British accents, which can be confusing for advanced dementia/A patients. Again, not the story here, I am quite sure.
You did specify non-British accents which seems at variance with this, below, and you certainly seemed to be talking about care assistants in the UK, otherwise what relevance was there in mentioning the non-Britush accents of the carters ? 
With the OP in mind, and older expats in care homes or hospitals in France (or wherever)- even if they speak good French (Italian, Spanish, whatever)- dealing with strong local accents, or accents from overseas territories, can be very difficult. NOTHING to do with race
But whatever, OP and her DH do not have dementia, are not contemplating a care home in France, Belgium, Switzerland or the UK - so bit of a red herring?