The UK always wanted to carry on as partnership in many things including the Horizon, alas red-tape of the `brexit` deal saw the whole Ireland border customs handling becoming a sticking point that saw lots of things put on ice.

So not a case of the UK joined the Horizon Europe, but was allowed to resubscribe.

I do know, that whole mess really upset many scientists, not only UK nationals, but others who saw them cut-off from the collaborations saw pain not only in the UK.

Politics is often science's best friend and worst enemy.