Can anyone help please - request to reduce working hours

[AnotherTroyforHertoBurn]

I currently work twenty hours, five a day over four.

I have some retrospective gaps in my state pension and will pay to fill them, I don't want to reduce my hours and find I am not quite paying enough and have them to fill as well.

I am paid £15 an hour.

Question being if I go down to 18 or indeed even 16 a week would I still pay enough NI to qualify for a full year from a pension credit point of view ? We can carry the loss of income.

TIA

The lower earnings limit is currently £118 per week, so you'd be fine.

Thank you