Well in spite of being an electrician myself, I decided with time constraints, the LABC fees, and the fact my meters needed repairing to get a firm in to do the job. It was a bank holiday week so just 4 days to do the rewire. In spite of them flooding the place on the last day, it was not finished.
Now I have a problem, the workforce was booked on another job the next week so they could not return until 10 days latter and I had loads of work to do re-decorating. Some I could do, other bits presented a problem.
The main problem was if I did any electrical work before they returned to do the inspecting and testing then they could not issue the installation certificate or the compliance certificate. So even work which did not require notifying I could not do, only electrical job I could do was install the TV cables.
So in real terms electrician on holiday means wait and do nothing. Maybe if I had asked the electrician doing the inspection and testing would have allowed me to have done some work, but he was not there to ask, I did ask if I could plaster, but there were some errors found which using common sense I knew mean I could not plaster, in one case a socket was not level so I plastered to within 6 inches to allow them to correct, they still knocked off some of the new plaster and I in the end had to level it myself.
I don't think there was one room I could finish, in some cases I wanted to run spurs so did not want to plaster, the idea was all sockets fitted would be on a ring, however that was not the case, and one socket which I wanted to extend from with another three doubles turned out to be a spur, so I needed to convert it into a grid socket, switch and fuse.
Some of the work was so easy, for example they had put the kitchen supply on a RCD, since the supply was with SWA and it fed a board with all RCBO's I wanted it not through a RCD specially since my mother can't reach the new board. But I could not DIY this, it had to wait until they returned.
So now having been in the situation when the electrician went on holiday or in my case went to another job, I know the answer must be leave it well alone until he returns, in real terms you can do less than if he was not working on the system.