How thick is it? In comparison to the carpet, that is? Is there underlay also? What will it abut to at the top?

Hi Victoria the thread is 3cm thick and the riser is 2cm. The current carpet is short pile not sure of the thickness and has underlay. We plan to have a runner and the top be finished as in this picture with the landing fully carpeted.

So is it more a replacement kit for treads and risers? Would have thought you could get something thinner. It will throw out the bottom tread.

This is thinner

https://www.jacksonwoodturners.co.uk/stair-klad-tread-riser-1000mm-1-pack-oak-lacquered-finish.html?gclid=EAIaIQobChMImqeu7Zr16wIViOntCh3hzQYDEAQYAyABEgLHXPD_BwE

Thank you Vivtoria. I don't seem to be getting my notifications so apologies for my lack of response. Thank you for the recommendations however, have decided to go with the solid oak as I'm not a fan of veneer. I have also figured that the steps will level out as I'll be adding equal sized threads to each stair....I think it will work out. I think 🤔