The old fencing in the garden had reached the end of its 10 year life and needed to be completely replaced. The first job was to remove the old fence posts and this was made much easier because it was screwed to the boundary wall and not anchor to the ground in concrete then the old fence lap panels were removed.
I dug a hole depth of approximately 600mm and place the new treated 75mm x 75mm fence posts in the holes and plumbed them with a level and used temporary battens fixed to the post and ground - this held the fence posts in the correct position and ensured they were plumb. The next job was to pour water into the hole and empty a bag of postcrete into it, mixing thoroughly - the beauty of postcrete is the 10 minute short setting time then the temporary battens were removed and a strong mix of ballast and cement emptied into the hole at the required depth. This was follow by the installation of gravel boards along the bottoms of the fence posts - These can be seen as sacrificial boards because they sit directly on the soil and will eventually rot. Since it cost a lot less to replace the gravel boards compare to the fence panels, it is a worthwhile investment.
I used Wickes timber fence panel fixing clips to attach the orange fence lap panels to the new fence posts and the tops of the fence post were left long because the owner wanted to fit trellis to them at a later date.