Des, they didn’t and as I had a head full of questions I didn’t think to ask I’m sorry.
MG don’t offer tinted windows at all. You have 2 options, you can either go for window blinds like these https://www.carshades.co.uk/shades-door-full-rear-p-7957.html
or you can get them professionally tinted using window film.
You don’t need permission for the blinds as they just pop in and out (I checked with Motability) but to have the film applied you will need to phone Motability and have it added to your agreement. They do stipulate that you may be asked to remove them at the end of your lease though. If you go the film route be sure to phone, NOT do it on live chat. For some reason they will flat out tell you that you cannot on chat but over the phone they just add it on for you. Be sure to say it’s the film as there is a difference between the film and window tinting which involves replacing the actual glass.
Both blinds or film are at your own expense and have to be sorted by you.