As Ewan says. Bee’s will grow the colony to the point that they think it can split. The queen will lay some eggs that will turn out to be queen bees when hatched, she’ll then bugger off with some of the hive as a swarm to find a new nest, leaving the new queen bee to grow up and continue in the original hive. ( A swarm is cool to watch form and fly off )
This generally happens whether the hive is managed or not.
Beyond that, they should look after themselves for the most part if you’re not wanting any honey off them.
There isn’t much to see though with a hive like that. You’ll see the bees come and go and thats about it.
As an aside, there is a parasitic mite that is currently affecting bee populations throughout the UK. ( Varroa ) Its a consideration that would likely affect any hive on the mainland these days.