Abolishing the monarchy would also obsolete the Sovereign Grant, so all the surplus income from the Crown Estate would go to the state without the royal family leeching their cut.

That said, there are some Duchies that are privately owned. In my opinion, these should be seized by the state during the establishment of a republic - if we're going to abolish the monarchy, we need to go the whole way and strip each member of all their inherited wealth too.

It's the very least they deserve, and would provide a much needed clean slate for New Britain.