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dot and dab is usually pretty uniform (ie if i find a dot then i can assume they'll be in line?)
Not in my experience. It all depends on who put it up. Often it is job given to a knuckle dragging labourer because it's messy and no skilled labour wants to do it. You may be able to find where the dots are by knocking on the plasterboard - if it's hollow sounding there will be a void behind it. In reality often the only real way to find out is to cross fingers and hope for the best.
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A lot of variables in the question you're asking. As Bobbo has mentioned you can't rely on the plaster blobs to line up. If you don't have any specialised wire fishing tools it might be easier to cut the plasterboard lay the wire in trunking (if you have room) and make good afterwards.
Otherwise I would use a fishing tool that looks like the string of metal beads you find on some roller blinds and a magnet. That way you might be able to fish a line through to then pull some cables. There is often very little room between the plasterboard and bricks.
There's an example of the flexible chain I'm describing in this kit of rods.
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Bobbo
Airhead
@Soul
Got a new TV arriving on Thursday (fitting Friday) which is completely flush mount (zero gap / full panel flat).
Two things need doing:
is going
The wall is dot and dab plasterboard to the internal outside wall (breeze block).
Job 1 seems pretty simple but wanted to check i'm not about to start a housefire:
I'm not going to plaster over the box hole as i may need it in future so i'm just going to cover with masking tape or something similar for now (it will be completely hidden behind the TV).
Second job, dot and dab is usually pretty uniform (ie if i find a dot then i can assume they'll be in line?). Does that mean if i cut a whole i should just be able to drop the cables vertically? They're only going about 40cm into a cabinet...
Edit: this is what i mean by zero gap btw...