In the next 30 days alone do you expect the taxable turnover to go over the threshold?
Only answer 'Yes' to this question if you expect to exceed the VAT registration threshold based solely on taxable supplies made in the next 30 day period.
This could happen when, for example, on 16th April a business wins a big contract to supply goods or services, which would mean the value of supplies made solely within the next 30 days, ie by 15th May, are more than the VAT registration threshold.
Find information on the VAT registration threshold