"Varilight do not recommend these for dimmable LED lighting, they do have a range of "treiling edge dimmer" that are recommended. For some reason these dont show up in the screwfix web list but can be searched for and bought!"
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Review 2 for Varilight 1-Gang 1/2-Way Ice White Push Dimmer 1 x 400W
"Some of the more modern spotlights are Dimmable LED types. These are very low energy so are good at reducing your bills. However, these dimmers cause these LEDs to flicker at certain brightnesses. I first tried different LED spots, but this made no difference. I thought it might be a faulty dimmer so replaced them like for like. This made no difference either. Only when I fitted a different manufacturer of dimmer did the problem get resolved. The may work fine with incandescent spotlights. Hope the info is useful."