Barcelona - Madrid - Paris - London


I'm confused as to whether I would need to purchase the Renfe Spain Pass or Spain & France rail pass for my trip.
1. Which is more cost savings?
2. For Renfe Spain Pass, does it cover all transport (trains, subways, buses etc) in Spain or only for long/ medium distance train?
2. Or should I purchase point to point tickets instead? How do I go about doing this?
3. Will there be a night train from Madrid to Paris? Is it included if i buy the Spain - France Pass?
4. Paris - London via Eurostar - how do I go about purchasing it?

Thank you for kind help!
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