From this....
To this.....
In new houses is the walls are made from soft Thermalight blocks and there is a 20mm ish cavity that you need to pack out to stop the bracket collapsing into the plaster board. 
So l marked out the wall bracket checking that there is no water pipes or electric cables running behind.
Using a hacksaw blade cut out the hole. Then measure the cavity and cut three pices of wood to cover the area where the long screws go through. Making sure to drill through the center of the wood.
Use a old wire coat hanger to pull some nylon string down inside the cavity to the old electric socket. Tape this string to some 2.5 cable and pull up.Remove the single socket and replace with a round junction box. 
Connect the supply to the new length of cable. This will enable you to feed a pair of double socket's behind the TV.
Fill and sand the area.Work out the best place to where the sockets will go that will not stop the TV sitting flat.
Replace the plaster board cut out and fit the wall bracket.Check for level put the TV on the wall bracket to check fitting.
Fit the second part of the bracket to the TV with the screws provided. Make sure they are not too long and cause damage to the TV. Mark the wall where the shelving bracket will start. This will be just under the bottom of the TV drill and fit top bracket.
Pull all cables through back of the shelving unit positioning each cable set for each shelf.
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