"MM" wrote:
I don't want to have to repaint an entire wall because of one or two
hairline cracks.

I believe I am right in saying that the Dulux paint matching service
only matches to the closest Dulux colour.

How hard is it to tint a colour to get an exact match? Or a match as
near as dammit so that only close inspection would reveal a
difference.

The colour is currently building industry standard magnolia, matt
emulsion.

MM

Unless it is from the same batch and properly stirred you are taking pot
luck in getting an exact match.