OK, but this is (or was) a DIY forum. Sorting-out and repairing the chase would be a couple of hours each, painting (once the plaster/filler has done its thing) would be 10-15 minutes per chase.
OK, but if the wiring is in good condition and passes the tests then it doesn't need to be replaced. OOI, last year I found some red/white/blue cable going to a light switch - it was in perfect condition but I had to pull it out because I wanted a second drop for a 2-gang switch.
When we moved in here the previous owners said they had had it all completely rewired, so "at least you won't need to spend anything on the electrics"
I remembered that comment as my TLC orders total crept past a grand!
Traditionally radial - rarely rings. Note that radial does not necessarily mean a linear chain, you can have as many branches as you want along the way. These are not "spurs" as such.
It can be just about anything. There is not usually a need for it being a ring at 230V, since the cables are usually running at substantially below their maximum rating.
Not specifically about lighting - unless say installing a new circuit in a room with a sauna:
That reminds me - I should buy some shares in Wago!
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