dont see why not. I would guess they are trying to make coming in by public transport more appealing, which is a government priority. Also they are trying to not be in deficit ... another government priority. The hospital i worked at 10 years ago had this (except it was more i think) and every subsequesnt place ive worked in has had it, with the exception of if you do shift work or community work, And loads of places do it so if it was illegal i think there would have ben a challenge already