Solo work, whether it's as a freelancer, remote worker, or entrepreneur can be exciting and motivating - it can consume a lot of your time! But whilst maintaining a passion can do wonders for your productivity, in the medium- to long-term it is good to establish work-boundaries so that you can be proactive about rest, relaxation and recharging.
How can you effectively say no? Keep focussed? Carve out time to recharge?
Also, he's quite priviledged. Rich, private school, and well connected. That gets you quite far in British society. There is a strange aspirational deference, where people like people like this as it gives an order and hierarchy.