This has been heavily affected by COVID. OC&C have a work hard, play hard philosophy and have regular 'fun' events which are totally optional. They are also open to suggestions for alternative ideas as long as one has the time and resource to make it happen.
OC&C also have a personal development back whereby they will provide you with a certain sum of money to help any personal interests ; this could include anything from flower arranging to drumming lessons, languages to finding a new hobby.
However, this is because that when we are at work, we work hard.
This is a really nice perk that I've never encoutered anywhere else.