After reading a lot of reviews I thought it best to go and tear the car apart and add some sound proofing,
First I started in the boot after pulling all the trims out this is what was there

As you can see not a lot!
and under the rear seats

And I also took off the tailgate trims too to find this

Now I can see why the road noise is so bad in Leon's!!
Got a load of this
Tredaire Boardwalk Laminate Underlay
http://www.underlay4u.co.uk/laminate-underlays/tredaire-boardwalk-laminate-underlay-105-55-798.php
Which even with next day del was only £55 for 15M2
only down side to this is its not self adhesive so spray glue is needed.
Started to cut and shape the underlay

Covered the boot floor, quarters and rear panel and put all the trims back

added too the tailgate and trim


And added under the rear seat too

This is what I have done so far, I plan to do the four doors and bonnet, this only took me around three hours to do this too, and the first drive up the road and the difference is great, its like switching your radio from front to rear speakers cant hear the road noise from the back
So I nice cheap way to sound proof your leon, hope this helps anyone thinking about doing the same, will add the door next weekend if it don't rain !!
First I started in the boot after pulling all the trims out this is what was there

As you can see not a lot!
and under the rear seats

And I also took off the tailgate trims too to find this

Now I can see why the road noise is so bad in Leon's!!
Got a load of this
Tredaire Boardwalk Laminate Underlay
http://www.underlay4u.co.uk/laminate-underlays/tredaire-boardwalk-laminate-underlay-105-55-798.php
Which even with next day del was only £55 for 15M2
only down side to this is its not self adhesive so spray glue is needed.
Started to cut and shape the underlay

Covered the boot floor, quarters and rear panel and put all the trims back

added too the tailgate and trim


And added under the rear seat too

This is what I have done so far, I plan to do the four doors and bonnet, this only took me around three hours to do this too, and the first drive up the road and the difference is great, its like switching your radio from front to rear speakers cant hear the road noise from the back
So I nice cheap way to sound proof your leon, hope this helps anyone thinking about doing the same, will add the door next weekend if it don't rain !!