Halfords do a 5 L tub of ready-mixed pink stuff - No need to dilute. (If you do buy the concentrate, then don't dilute with tap water!

). I had a look at the label on the back, & it lists cars which it's suitable for............................... VW being one of them.
Whether this is a false claim like the oil & Mobil 1 being VW approved, thing........................... Who knows!!