If you’re 16 or over you can open an account (provided you meet the eligibility criteria), with an initial deposit of up to £1,200, and then make further contributions of up to £200 per calendar month. (You can contribute to another Nationwide cash ISA product at the same time, as long as you don't exceed your total ISA tax-free savings allowance each year).
You can open in any branch, using the online application form (select apply button), via the Internet Bank or the Banking app (if you have registered for Internet Banking). If you open your account via the Internet Bank or Banking app, you will need to make a minimum initial deposit of £1. However, please note that your initial deposit must be completed within the first calendar month of opening.