Yup £480 option unless you get the Griffin edition (where they cripple the choice of colour, naturally). Yet despite being an option it still has all the other bits like forward collision alert, how does that make any sense?
I think it’s because things like forward collision alert affect the EuroNCap safety ratings, whereas parking sensors don’t. Thinking about the original question, could it be due to the fact that manufacturers like Ford and Vauxhall often have a line at the bottom of their Motability price lists saying that parking sensors will be fitted for Motability customers where not included as standard? These will almost always be the cheaper aftermarket sensors fitted at the dealership (which give the audible warning only) rather than the addition of a factory option where they are fitted during assembly and therefore have the visual warning as well.