I know this is a huge question. I'm curious if there is any consensus, or at least competing theories, about whether the inhabitants of Britain during the Late Bronze Age would have spoken an "Old European" language like Basque or Etruscan, or an unattested Indo-European language potentially associated with the Beaker culture.

Do place-names or archeology give us any hint about about what language might have been spoken before the introduction of Brittonic?