there should be a sticker or something, if not then 32-33 psi will be fine (haynes manual says for 195/50/15 it should be 33 front and 30 rear - just as a reference)
Yes, I'm 95% sure that they were fitted to Astras as standard.
Yes, pressure on the sidewall will be maximum pressure, not pressure to run. How does a tyre manufacturer know what car you're going to put the tyres on?
It'll tell you in your manual or in your Haynes book.
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