Is it a major job to remove it?.....is it all in one piece or is the rear carpet seperate??
In three parts... Rear, NS front, os front.
To remove the rear you need to...
Pop the covers off the back of the front seat runners, one Philips screw.
Slide the front seats as far forward and as high as they go.
Unscrew both rear bolts on both front seats.
Pull the two handles infront of the seat base and lift the front edge up.
Start in one back corner and pull the carpet out from under the sill trim, only a1/4" overlap.
And work your way forward. Repeat tother side.
Then at the back of the tunnel lift the carpet up and pull it up and back away from the centre console. It is stapled loosely to the front carpets under the console near the handbrake. Simply tug and it ought to come free.
Refit seat base and front seat bolts and the car remains perfectly useable.
If it all goes Pete Tong, then worry not... ALL Omega rear carpets are identical. Fronts are obviously sided left and right but also differ left to right hand drive.