I've got some plinth, pelmet and cornice to cut for my kitchen, all need 45degree angles cut in them. I tried a mitre saw for one of the pelmets but no matter how well I clamped the piece (using the build in mitre clamp) it would always slip slightly or slight sideways movements of the saw occurred and resulted in edges which would not meet correctly. What's the best way of cutting such angles? I looked at the pieces as installed in a display at B&Q and they have perfect angles/edges. Do I just need a new mitre? I bought some fine blades for my jigsaw but don't have anything to present the pieces as the appropriate angle to it.