I'm sure it was here long before Neighbours was seen here.
Back in the 1960s we had a Northern Irish teacher at the school who used to
do it a lot.
Brian

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Why do some people raise their voice at the end of every sentence? It
sounds like they're asking a question. Glaswegians and Australians are
particularly bad for it. Are they unsure of everything they say and are
seeking confirmation?

I think a sentence like "I saw Helen (?) in Tesco (?) and she said that
she and James (?) were expecting a baby." (where "(?)" denotes a rising
tone) there is an implied "You know Helen, don't you?", "You know where
Tesco is, don't you?" and "You've met James, haven't you?" - as if the
speaker is constantly seeking confirmation that the listener knows
who/what the speaker is talking about.

It's referred to as "up-talk" (because the pitch goes up at the end of
each clause/sentence) and it's said to have come across to the UK either
from West Coast USA or from Australian soaps such as Neighbours.