You can make deposits into your Cash ISA through any combination of recurring payments, one-off deposits, or instant bank transfers, so it isn’t mandatory to make recurring deposits into this account. You can check and amend any payment settings you have active in the Settings tab.
Deposits of £100 or more can be made through instant bank transfers, which are available in Home > Add money.
If you’d prefer to solely deposit through instant bank transfers, you can cancel your Direct Debit with your bank 👍