Not sure on part number for lhd but i changed my rhd drivers side grab handle today part number 1k2867180c there is a colour code after this too check with dealer.
Remove 06 civic door panel.
Set the blade of the flat head screwdriver on the inside of the interior door handle in the seam around the square panel inside the handle.
The grab handle can be replaced no need to change the whole door panel remove door card and remove plastic glue holding the part in place then fit new part and glue the fingers into place.