Bent bars after bike got bumped... bummer.

Just went to go for a ride to find my bike's been bumped by a van while locked up outside my flat. Brakes, gears, wheel and fork all seem fine and unscathed but the bars are well bent and it looks like the stem's cracked. Plus my nice old ritchey grips are mangled. See pics below.

This is my eighties muddy fox courier which I use for everything. Got a few questions, I'm pretty new here so hope this is the right place to post!

• is the stem fucked? Looks like a big crack but will I die if I keep using it?
  
• suggestions for replacement bars / stem (if fucked) / grips?
  
• any ideas what size stem and bars should I be looking for? I'm hoping to find some decent second hand bars and stem but not entirely sure what size everything is. I don't have calipers or anything so hoping someone knows just from the pictures and era of bike.
  

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