Posted: 09/03/2014 at 11:02
No cheap & easy answers, I'm afraid. The only way you will get to use it this summer is by turfing it. If the clay is compacted, you'll need to use a rotavator to break it up, add grit and organic matter (mushroom compost will likely be the cheapest) to improve drainage, then level it with a rake, tread it down, rake again then turf it and water it every week for the rest of the year. You'll need to keep off of it for at least two months.