My cat uses his scratch post regularly however he insists in scratching the stair and landing carpet any ideas how to stop this
Is his scratching post horizontal or vertical? If he loves scratching on the stairs and carpet perhaps he likes horizontal surfaces more so a horizontal scratching post will work better for you. If you can, get more than one.
I would too buy him a horizontal scraching post. We have both for our cat, a scraching pole and a cardboard scracher, which he loves even more