Jeez Simon... you must hold the record for the longest original ownership of a 135i in Oz!
Can't help with the service recommendation but I've not tried West Coast yet. My 520d will be due for it's first service soon so I guess I will find out.
BTW - Need two new front Bridgestone 225/50R19's for the wife's X5. $649 each from AC or $495 each from Wheels World in Osborne Park!!?? Go figure that one out!