Hi Mark @Billy Boy,
Thanks for your reply.
Do you mean covering the entire base board in cork, or just where the track goes? I've already been advised not to use any underlay as it makes the 009 track look unrealistically high when it is ballasted. But if I don't use underlay and apply ballast with PVA, it will be noisy.
Some people recommend using Copydex instead of PVA for ballasting as it is more flexible and therefore quieter. Looking at prices of Copydex, it is very expensive though.
Would you mind letting me have the name of the Ebay seller for the buildings, please?
I'll keep you informed of my progress. Have you any photos of your layout?
Best Wishes
Andy