Walls are not straight, and the worktop has to pretend they are
A worktop cut dead straight along its back edge will show a gap against your plaster, because plaster is not straight. Scribing is the trimming of that back edge on site so it follows the actual line of the wall. It is fiddly, it is the reason a stone fit takes hours rather than minutes, and it is most of the difference between a professional installation and a bad one.
The balance is due before installation, so the fitting day itself is about the work rather than about money. Our installers arrive with the pieces protected and labelled by run, and with the drawing that came off your template.
Everything we do that day is covered by the 5-year workmanship guarantee, which is separate from the 25-year material warranty on the stone itself.
Fitted 5–10 working days from template. Deposit at template, balance before installation.