Andy
Went into my local Ford dealer ( Arnold Clark ) and spoke to the guy in the parts department. He was pretty useless to be honest. I have found out myself from looking at other 06 focus's that if i want an armrest i have to also change a part of the centre console closest to the drivers seat. The zetec seems to have it as standard so i guess i might have to check a few local breakers to see if they have any as i imagine the parts would be expensive from Ford directly.
Cheers