The first post.

You will find this job much easier with 2 people the posts are much heavier than you may expect and it would extremely difficult to level and pack by yourself. It was decided that the first post should be a corner. The hole was marked with a spade and dug out to a depth of approximately 2ft deep and about 18" diameter. Digging post holes in heavy clay is not easy but having the right tools helps a lot.
You will need a narrow spade for slicing up and post hole hole tool for lifting out the spoil. The first post needs to be set solid in concrete we used a rough mix 4 parts lime stone 1 part cement mixed thoroughly. Don't add any water to the mix at this stage. The post was inserted into the hole leveled with spirit level. Always check both ways horizontally and vertically. It needs to be straight up and running in line with the slots. Drop in a few shovels of concrete and check again. Make any adjustment then pack down the concrete. Add a small amount of water then shovel in more concrete and again check levels, pack and so on. Don't add to much water It's no good ending up sloppy better dry. As you fill the hole it will start to hold the post firmly. Don't rock the post otherwise you will loosen it. When filled the post should be left overnight to set.