Well finally fitted them, only took about 3-4 hours BUT never checked them before putting all the trim back.
DIDN'T WORK.
Stripped it back (easier second time)
Eventually found out there were 2 BROWN wires. One going to rear of car and one going into the tailgate. IDIOT....
Fixed now and all sensors work perfectly.
I have Galaxy grey Civic and chose £17.50 sensors in GREY colour. Match is OK but if had the chance over again , I would spray the black ones as the gray is darker than the body colour. But for the price....second to none.
Cheers Ricky