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I start with https://www.gov.uk/foreign-travel-advice
FWIW I travelled through France last week (Eurostar to Paris and back). I was asked to show my vaccine proof at border control each way, but it was just a visual inspection, they didn't scan the actual QR code to verify anything.
Also had to show vaccine proof at a few tourist places (Eiffel Tower, art exhibition) but, again, just a visual inspection and not a proper scan. Wasn't asked to show it at any bars or restaurants from memory.
Also I had the Honourable Declaration thing that the French said they required for entry, but no-one at the Eurostar border was interested in seeing it at all.
tl;dr If you're triple vaxxed then it's all quite easy. No testing requirements at all for France.
Where do I go on the internet to find out, or can someone tell me here, what I need to know and do, regarding COVID regs, to: go by ferry from portsmouth-santander, by car from spain to portugal, and back home from there by car through spain and france via calais?