Well quoting the forum
"
The relay is mounted on the 8-way relay carier, it should be located in luggage compartment, right rear, behind the trim (I think they mean passanger side)"
It looks like he means in the boot, guessing it will be on the passenger side but it may be the drivers side, hopefully it should be marked with a five.
Got to remeber this guy is american so the motor will be left hard drive, but since they move the fusebox to the drivers side in right hand drive cars it would make sense that they do the same for the relays.
Looks like an explore behind the trim in the boot may prove fruitfull, might get a chance this weekend