can you not take it back
, demand a new one or replacement 
hope it works out
Motorpoint don't really seem to want to know at the moment.
I've now sent them a letter spelling out that I am covered under sale of goods etc. They started off by saying I hadn't told them quick enough but a quick chat with my solicitor shows law says I actually have up to 6 months to reject.
To make matters worse I found some more areas with dirt under the paint

I don't think there is much to be done until this paint expert has a look, I'll be gobsmacked if they say there is nothing wrong, the car is a complete mess.
I'll keep you updated.