Weren’t the predecessors of the Celts called the ‘Beaker People’, due to some of their pottery?
I think that was due to their having been big fans of the Muppet Show.
/rimshot
The Book of Invasions, which is an Irish medieval compilation of older sources and oral traditions, gives out (I think) four successive invasions, without an exact chronology. It used to be considered quaint, but things like ag practices, weapons styles, and burial practices turned up in the correct order when archaeology started in Britain. :’)