It's a main course salad but looking at the size of the container in comparison with the length of the fork, I wouldn't classify it as a Massive Salad.
I expect there are lots of Mumsnetters who will pop up to say they couldn't possibly manage that and that something on it is 'too rich', and will come up with an estimated calorie count for you without you having asked for one, and will give you some unsolicited opinions on how you could make it 'healthier', though.
I had a ham, Emmenthal, pickled vegetable and mustard mayo focaccia sandwich from a local bakery near us that does a daily sarnie using its own fresh baked bread. That definitely was massive; it barely fitted on to my plate. I still shared one of their fresh-baked Italian fennel sausage rolls with DP as well though.