ohhh ok, I was up in Islington in Newcastle yesterday. You should get an SVX
The update is that I have spoken to the manufacturer, there are more than enough in stock, as well as an availability for more.
They can manufacture or can have manufactured LHD SVX heater cores too, but they will first need a sample. The more the orders the cheaper it will be for you.
The other options are to get in touch with Zexel, Calsonic or Nippon.
Jordan.
ps, for aussies, there was a post once from a guy from SA and no one on this forum replied to him, he was asking a question on this forum because he blew his heater core and needed to fix it, his username was down under or down_under