selling car to business card dealer

They basically offer bottom trade price, export it, and sell it on. Quite legit, and very quick.

I got a lot more selling privately.

They are very useful if you have a car to get rid of that isn't attractive to the main stream secondhand market - in my case a 10-year-old RHD UK-registered car. The car was collected and cash paid within hours of making a phone call - and I was able to report the car as "exported" to the DVLA.