OK, here is some clear and factual info. about living in Spain, relevant until the end of this year:
Information for British citizens moving to or living in Spain, including guidance on residency, healthcare and passports.
www.gov.uk
No excuse for not knowing or following the rules, or thinking that you can just get away with it.
FWIW I have two relatives, one lives in Spain, the other in France, and have done for decades.
The Spanish one long ago decided to do the job properly and took out Spanish citizenship. He feels no connection to the UK, his life is there.
The other cousin likewise, not sure what her arrangements are but she's been there for over ten years, and soon to get married to her long-term French partner. I'm looking forward to the wedding, they do these things in great style, no fatuous religiosity involved. Unless you want that on the top, certainly they don't and I'm expecting a big party for a couple of days, in an idyllic location.
Quite how this will affect we roaming gypsies I don't know, but there are, and always have been rules and I do expect that they will become enforced more tightly in the future. And may change again.
No point moaning about it, what will be will be, just have to hope that Boris negotiates a compromise, though I don't think it is top of his priority list. Couldn't possibly do a worse job than his predecessor.
They like us and we like them and we like to do business with each other. Hopefully some sensible arrangements will emerge, now that we, the people have given him a clear unambiguous mandate, and he appears to have become a more serious person beneath his previous buffoon image. Well we can hope.
There is a year to sort this out, let's hope they crack on with it, watch this space.