I would like to prepare an area of my garden for the construction of a deck of approximately 15 square metres. Part of the area is currently taken up by a concrete platform which is cracking and slipping away from the building due to subsidence. Once this platform is broken up and removed I would like the ground to be levelled to the extent possible given the existing contours. Holes should then be dug and concrete footings established for later construction of a deck frame.