Blow me down only had my 61 plate Octy a week and someone has clobbered my offside wing mirror. The mirror is ok but the plastic surround has been cracked, stuck it together with super glue but do not know how long that will remain. One thought I had is can you taken the mirror apart to get to back of crack and reinforce it. Or how much are they these days . in anthrocite grey?.

http://www.briskoda.net/forums/topic/250637-wing-mirror-indicator-needs-replacing/

This might help. Failing that try a search in the octy 2 section HTH