1950’s house with single sockets in the rooms

I own a 1950’s house with single sockets in the rooms – I think these are pretty much the original sockets as they are not sunken into the walls but stick out. I would like to add 2 extra sockets in the main room and 2 more in the lounge. What do I need to consider before getting someone in? Does this mean the fusebox has to be replaced? will the new sockets be sunken in and not match the existing? Do they all need to be sunken in? Could the old fusebox handle extra sockets? What disruption to walls / floorboards / carpets will this be?

Denise - CR4

Asked: February 28 2018