Thanks for the advice and the links.
I've sent an email to them to check whether the part they list for the steel-wheel is the same as my step-fathers' 2010 1.2s model. (their web-site does not list anything newer than 2009 and doesn't give an option for the 's' model). So just waiting on a reply.
The Honda part number for the 1.2se steel-wheel is shared with the Honda Insight, but that hasn't lead anyway useful for me yet.
I did stick that part number into Google though and found a company in the States which is selling the same wheels to fit the Jazz at a clearance price of $60 each. Again, I'm waiting on an email reply to see if they will ship over here.
I tried Ebay as suggested also but thats no good for full sized steel wheels (the space saver being the last resort choice right now).
It seems these Jazz wheels are really, really rare - even from breakers. I guess Jazz drivers must the the safest on the roads