I forgive you for munching your way through my strawberry plant, because you are so pretty.
After some internet research I think this is a caterpillar of a Knotgrass moth, Acronicta rumicis. (Please do let me know if I have got this wrong.) There are a baffling number of caterpillars. Click on the name Knotgrass moth, if you would like to see what he will become. Not as bright as I had expected, but still very beautiful. I was amazed when looking through the list of UK moths to see the enormous variety. Did you know that there are 8 times as many moth species as there are butterflies? Perhaps they need a PR agent, moths just are not getting the publicity they deserve.