Your interpretation of this as work is pretty liberal and likely to fall foul of the English rules until 12th April.
Cars can be sold via click and collect in England and Wales
The government has permitted dealerships to operate a “click and collect” service, meaning that
you can place your order online and collect the car from a local dealership (leaving your village, town or city area without a “reasonable excuse” is illegal under lockdown), or have them deliver it to you, in a contact-free manner.
https://www.driving.co.uk/car-clinic...irus-lockdown/