Hi Paul - Welcome to the forum. There are a number of companies selling boards, in various sizes - if you get hold of a copy of Hornby Magazine, Railway Modeller etc., there are usually a number of ads., from these companies. Before deciding on your board, you might want to consider whether your layout is going to be a permanent fixture, or something you have to move when you have finished "playing". Also, depending on your woodworking skills, you could easily make your own. The top surface could be 9mm/12mm ply, and it should sit on a 3x1 framework. If you look at the Model Railway Solutions site, you can see how the boards are constructed. Their products are not cheap - I used them, and built my boards (they come in kit form) in 2013/14 and they are still very solid. I hope this is of some help, and I and others will be interested to see how you get on. BB