The UK convention had always been to call TV shows Series but it’s become more and more common to sometimes refer to newer shows as Seasons, in the US style. I don’t think I’d ever heard of a UK TV show being called a Season until the big HBO type shows have become globally popular in the last couple of decades and the US term started to become interchangeable. Classic Doctor Who being an older show, was and is a series. If fan convention has been to rename the classic show as Seasons for simplicity (due to the confusing restart of the numbering on the new show) then fair enough… but it’s still wrong.
