Do you cut right thru in one cut? It looks like the only way that blade would do the job. Screwfix don't seem to do them but Toolstation does.
Also, I see discussions concerning warming the vinyl up before cutting? I suppose I could sit a tile over a bowl of really hot water for a while, before cutting.
For straight cuts on click vinyl I score and snap. For more complex cuts I use a combination of jigsaw/hand saw. You'd be there all day trying to get all the way through it with a stanley knife!