@chastw If you are considering buying a new Audi, I strongly advise configuring the car on Drive the Deal and seeing what discount is offered for main dealer factory ordered brand new cars to your exact specification (Audi is one of just half a dozen manufacturers that they work with). You can then go to your local Audi dealer and ask them to match it (or get very close). I am currently discussing a possible new vehicle purchase with my BMW dealer and, having adopted this approach, I am discussing discounts between £12-16k (albeit it’s a more expensive car than a Q3).
I don’t know the detail of your daughters disability, but if she is a full time wheelchair user and she also needs a ‘permanent and substantial’ adaptation (for example, we have to have a person hoist to get my wife in and out of the car) then, in addition to any negotiated discount, you can also get VAT exemption on the full retail price of the vehicle, including optional extras. This VAT exemption continues throughout the time you have the car for things like servicing and maintenance. Also, as you are eligible for a Motability car, you don’t pay Vehicle Excise Duty (road tax), including the exorbitant first year rate (showroom tax) or the over £40k premium (luxury car tax).
As a combined result of all of the above things, I am looking at a potential cost saving (versus a retail customer with no VAT / VED exemption and not having negotiated a discount) of up to 35%. Added to the £12k sacrificed benefits (plus AP) that we currently pay to Motability, the first 3 years depreciation is pretty much wiped out, by which time we can either start again with another new car, or keep the car that we already own outright.