I think Chris might mean:

'UK tourists must provide '43 details' under Spain's new 'Big Brother' rules'

A pint goes to the first person that can find the original source, plus the list of 43 details. They do name a particular Spansih offical, but I can't see anything from an official Spanish web source.

From my searches the Birmingham Mail seems to be the primary source, and everyone else copied them:
'Currently, car firms and hotels are required to collect 14 pieces of information from customers to share with the authorities. This will go up to 64 for car companies in December, while accommodations will now need to record 43 details about their guests.'

And the closest to a list I could see :
1 First and last names
2 date of birth
3 gender
4 nationality
5 home address
6 landline
7 mobile number
8 email address;
9 number of travellers in their group
10 bank account number
11 cardholder

The internet is a weird place.

You can't trust us third countries! I'm already trying to export bread packed out with sawdust. If only we were still in the cool kids club eh. I mean, who needs freedom of movement really? :/
Gibraltar people must be so upset/frustrated.

Ok morning rant over. That was close.

Is it this one, Chris?

'Being bare-chested in the street has also been banned in some areas. You could be fined up to €300 (around £250) for not following the rules.'

Ref:
https://www.which.co.uk/news/article/can-i-travel-to-spain-from-uk-aaZSk8j2LdPj

Haaah! Finally. Now if they do that for Aberystwyth too, we've removed freedom of movement for a whole region/demographic of England!

Came on email from Brittany ferries about their new electric ferry!!!!!! But go into google and put ‘New rules in Spain’

Is it this one, Chris?

'Being bare-chested in the street has also been banned in some areas. You could be fined up to €300 (around £250) for not following the rules.'

Ref:
https://www.which.co.uk/news/article/can-i-travel-to-spain-from-uk-aaZSk8j2LdPj

 Their changing the rules of game next year from Jan first!!!!