Don't know how you feel about the "Express" (tendency to the right mostly) MeP, but here's an article from 2016.
British workers can be discriminated against, EU rules | UK | News | Express.co.uk
I personally don't see how any company or employer can specify a language skill unless they are for language education, interpretation or dealing with foreign customers in their own tongue. Living & working in UK the language is & should be English no ifs or buts! I chose to live in Germany & guess what? No-one is bending over backwards for me to have my own mother tongue implemented, the attitude is, you chose to be here, speak & write our language, you don't want to, pack up & ship out!
And as to the shrieks of faux outrage for you being a racist because you want our country to have a strong immigration policy, well ain't that just typical of your liberal lefty snowflake idiots! The cry of racist is the SOP of the left, they've no concise or relevant argument so to shut down opposition & hide their feeble ignorance they pull the Ace in the pack & scream racist! Weak, feeble, & ineffective.
Next time one of these useful idiots goes on about the need for fruit pickers or scrubbers, challenge them about "Would they do the hours demanded for the pay they'd receive" & if they're truly honest with their answer it'd be a big fat "No", so just who is the discriminating racist bigot now?