Can anyone tell me that you can order a new wheel chair for £100 when you order your car , I read this somewhere do you know if this is correct?
Yes.
Just order it when you order the car. It is classed as an aid/adaption on the dealers screen (I was with someone who ordered one recently):
Details here:
https://www.motability.co.uk/products/adaptations/lease-a-manual-wheelchair-with-your-next-car/