If you go on VW web site and look at there price list for Motability there is more models on there to choose from.
Unfortunately, you can’t go by the manufacturer price lists Brian. They are only issued quarterly and can go out of date very quickly, often within days. Over the last year or so cars have been removed from the scheme almost every day. In order to be able to order a car it has to be available on the Motability website, so as of today only 2 variants can be ordered. The added complication, of course, is that the Motability website isn’t fit for purpose and cars can be removed one day only to return the next. Hopefully that will be the case with the ‘missing’ ID4 models.