ATS do a Turbo-X blade which cuts porcelain tiles with ease https://www.atsdiamondtools.co.uk/product/turbo-x-diamond-porcelain-blade/ although I've just bought a blade off Amazon for £8.99 which looks almost identical. Use a steady hand and don't force the cuts. Make several passes as opposed to trying to cut all the way through in one go. For cuts which might be seen finish the edges with a diamond hand pad. ATS sell them but TBH a diamond sharpening stone like these work well https://www.screwfix.com/p/magnusso...rc=aw.ds#product_additional_details_container