HM Treasury; rules are in place to ensure that it does not offer market-leading products that would stifle competition. Operations NS&I's head office is in Pimlico, London, with operational sites in Blackpool, Glasgow, Birkenhead and Durham. However, its entire back office operation is contracted out to a French company, Atos Global IT Solutions and Services, who use a site in Chennai, India. NS&I first outsourced out its operations in 1999 to Siemens Business Services; some 4,000 staff were transferred to Siemens, leaving 130 NS&I staff responsible for the design, management and marketing of products, and managing the relationship with Siemens. A 2000 report by the National Audit Office stated that the contract was better value than keeping the operations in-house, and suggested other government departments could learn from the way this public-private partnership was procured and managed. The Siemens business unit was acquired by Atos in 2011. In the past the bank offered many of its services through post offices, but in November 2011 it was announced that most products would only be available by telephone, online, or by post; Premium Bonds would be the only remaining product sold in post offices. From 1 August 2015, NS&I stopped selling Premium Bonds through post offices, and became a purely direct business. Products NS&I offers a wide range of savings and investment products, specialising in tax-free and income-generating products. As of December 2019 the following are offered: Premium Bonds Direct ISA Junior ISA Income Bonds Direct Saver Account Investment Account Some further products are off-sale and only available for roll-over by maturing investments: Index-linked Savings Certificates Fixed Interest Savings Certificates Guaranteed Growth Bonds Guaranteed Income Bonds Former products Products which are no longer available with NS&I include: Children's Bonds Children's Bonus Bonds Investment Guaranteed Growth Bond TESSA-only ISA Fixed-Rate Savings Bonds Pensioners' Bonds and Capital Bonds Ordinary Account/Treasurer's Account/SAYE/Yearly Plan/Deposit Bonds FIRST Option Bonds National Savings Stamps and Gift Tokens Easy Access Savings Account Gallery See also National Savings Movement National Girobank Rainbow Dance, Post Office Savings Bank film, 1936 Blythe House, London, headquarters 1903–1970s References External links Banks established in 1861 Banks of the United Kingdom Non-ministerial departments of the Government of the United Kingdom Executive agencies of the United Kingdom government 1861 establishments in the United Kingdom Government-owned companies of the United Kingdom Postal savings system