"an election will be held to fill the said vacancy, otherwise the said vacancy will be filled by co-option". What does this say about a vacancy which generates no candidates ? Does it say that an (in the singular) election will be held or multiples elections until its filled . The co-option bit of course refers situation which an election is not demanded. Personally I don't think anybody envisaged an election being called that might not attract candidates
It can of course happen if there happens to be more than one vacancy
ElectionDateResultRecharge
Long Ashton Long Ashton ward,
(Election for 2 parish councillors)09.12.2021Uncontested£122.00
Long Ashton Long Ashton ward
(Election for 1 parish councillor)10.02.2022Uncontested£92.00
Long Ashton Long Ashton ward
(Election for 1 parish councillor)10.03.2022Uncontested£92.00
Long Ashton Long Ashton ward
(Election for 1 parish councillor)31.03.2022Uncontested£92.00
Long Ashton Long Ashton ward
(Election for 1 parish councillor)14.04.2022Uncontested£92.00
Long Ashton Long Ashton ward
(Election for 1 parish councillor)09.06.2022Uncontested£92.00
Long Ashton Long Ashton ward
(Election for 1 parish councillor)14.07.2022Uncontested£92.00
Long Ashton Long Ashton ward
(Election for 1 parish councillor)11.08.2022Uncontested£92.00
Long Ashton Long Ashton ward
(Election for 1 parish councillor)29.09.2022Uncontested£92.00
Long Ashton Long Ashton ward
(Election for 1 parish councillor)03.11.2022Uncontested£92.00
Long Ashton Long Ashton ward
(Election for 1 parish councillor)15.12.2022Uncontested£92.00
Long Ashton Long Ashton ward
(Election for 1 parish councillor)02.02.2023Uncontested£92.00
Long Ashton Long Ashton ward
(Election for 1 parish councillor)16.03.2023Uncontested£92.00
https://www.bbc.co.uk/news/uk-england-somerset-64175159