Private drive work

Apologies if this is a stupid question.
If I were to buy an E or S-Class or similar and do private driver work for friends/neighbours or whomever to the airport etc, is it simply required to have hire and rewards insurance or do you have to be registered/checked etc and have that sticker in the car?
I'm not talking about doing Uber/Bolt work, just private jobs from people I know or will meet.
Any advice greatly appreciated.