I'm not sure if you'll find one in a junkyard over there,but you never know......
An early
Austin Mini heater is a small self contained unit with demister hook-ups.
As you can see on the listing it won't break the bank!
That's what I'll be fitting in my '50,as no one over here can rebuild my original core.
You might find one a bit closer to home on ebay/craiglist etc.
Good luck!