The guidance hasn't change any different from the first lockdown..
i.e.
If possible work from home.
If you can't work from home adopt suitable social distancing, PPE, hand washing etc..
So far self employed electricians/plumbers etc have never actually been told to stop working completely..
Not sure if this guidance page has been updated yet for the latest announcement...
https://www.gov.uk/guidance/working-safely-during-coronavirus-covid-19/homes
But as far as I know providing you don't have any symptoms..
and or not isolating due to others in your household having any symptoms..
Then its just get on with whatever you can..
and keep your common sense and health & safety good practice hat on!
Throughout the whole of the first lockdown don't think I knew of any trade counters been told to close..?
Just a few opening hours & some operating procedures were changed..
But you could still go out and collect materials to do customers jobs.
Here's the Gov general advice for 5 Nov:-
https://www.gov.uk/guidance/new-national-restrictions-from-5-november?priority-taxon=774cee22-d896-44c1-a611-e3109cce8eae#businesses-and-venues
Guinness