What are your thoughts on this sign?

Earlier today, I saw this vehicle with an unusual sign written on the side "we speak English." And thought that's a GAG question.

The vehicle belonged to some gardening company, I never saw the owner, so I can't comment on their race.

But what's your thoughts? Why would a company in the UK write "we speak English" in large letters on work vehicle?

Note: I see lots of vehicles from England and Ireland here as well as local Welsh ones. Many have bilingual signs, but I've never seen one with these words on.
What are your thoughts on this sign?
What are your thoughts on this sign?
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