Quick cover for short ish term

Having layed the hedge and removed some unwanted plants we have a small patch of open ground that I want to plant something on. The area may not be available very long (a year or three) due to renovation plans. The hedge to the left is on the west(picture taken approx 10.30am). Our soil is slightly acid clay. I was thinking wild flowers but wonder if our soil may be a little too nutrient rich for some? Any thoughts on what to plant would be great thanks.