one thing to bare in mind as it’s very confusing! The A class is available in the Hatchback with the added bonus of different Packs included within the AP. However not on the Saloon ? And apparently between Mercedes and motability you can not add packs as an add on, although I was told You could. So definitely do your homework first so you have the relevant questions ready.
The saloon looks amazing but the hatch offers better value with the added packs only adding something like £400 for a £1600 extra. Latest brochure here.
http://tools.mercedes-benz.co.uk/current/passenger-cars/e-brochures/new-a-class-w177.pdf?owda=misc
and for Mercedes (and others) sytner group website have great pictures in their used car search, helps with colour choice etc. You may find it useful
https://supersearch.sytner.co.uk/