What on earth are you blithering on about now? Of course moving around between countries in a pandemic is risky, which is why the more sensible ones have rigorous testing and quarantine protocols for visitors and returning residents. Naturally, the UK doesn't, not really.
Also, you seem to have fixated on the virus originating in Spanish farm workers. As the various reports make abundantly clear, it spread within local Spanish populations to holiday makers and was then brought back to the UK and other countries. Nowhere does it say it was spread by those farm workers coming to those countries- I'm not sure why they would, seeing as they'd be working in Spain. Also also, the original report that seems to have set you off was about Romanians being flown over to work here back in March/ April or whatever. So not only a different country, but several months before the Spanish variant took hold.